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CBSE Class 9 Answered

<div> <div class="excercise_cont PR" style="padding: 15px 20px 30px; margin: 0px; border: 0px; outline: 0px; font-size: 14px; vertical-align: baseline; position: relative; width: 918px; overflow-x: auto; overflow-y: hidden; font-family: Lato, sans-serif; line-height: 20px; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <div class="que_wrap c53555b" style="padding: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; color: #53555b; background: transparent;"> <div class="disable_height" style="padding: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; background: transparent;"> <h3 class="excercise_que" style="padding: 15px; margin: 0px; border: 1px solid #dde2e6; outline: 0px; font-size: 15px; vertical-align: baseline; overflow: hidden; background: transparent;"> <div style="padding: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; background: transparent;">Assume&nbsp;<img class="Wirisformula" style="padding: 0px; margin: 0px; outline: 0px; vertical-align: middle !important; background: transparent;" title="Double click to edit" src="https://images.topperlearning.com/topper/bookquestions/1172_ba10f1f1134c30b6a287536dbff3e686.png" alt="" align="middle" />, unless stated otherwise.</div> <div style="padding: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; background: transparent;">What length of tarpaulin 3 m wide will be required to make conical tent of height 8 m and base radius 6 m? Assume that the extra length of material that will be required for stitching margins and wastage in cutting is approximately 20 cm. (Use&nbsp;<img class="Wirisformula" style="padding: 0px; margin: 0px; outline: 0px; vertical-align: middle !important; background: transparent;" title="Double click to edit" src="https://images.topperlearning.com/topper/bookquestions/1172_b30c14c35f7e20752f646111109b139b.png" alt="" align="middle" />&nbsp;= 3.14).<br style="padding: 0px; margin: 0px;" /><br style="padding: 0px; margin: 0px;" /></div> </h3> </div> </div> </div> <div id="question_solution_1172" class="show_solution" style="padding: 0px; margin: 0px; border: 0px; outline: 0px; font-size: 14px; vertical-align: baseline; font-family: Lato, sans-serif; line-height: 20px; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <div class="blut_tb noMar f14 FB" style="padding: 5px 0px 0px 20px; margin-right: 0px; margin-bottom: 0px; margin-left: -10px; border: 0px; outline: 0px; vertical-align: baseline; font-stretch: normal; line-height: normal; font-family: Lato, Arial, Helvetica, sans-serif; width: 127px; height: 33px; display: inline-block; color: #ffffff; margin-top: 0px !important; background: url(http://css1.topperlearning.co.in/img/subjects_sprite.png) 0px 0px no-repeat;">Solution</div> <div class="mcq_cont" style="padding: 15px 20px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; background: transparent;"> <div class="solution excercise_sol textbook_solution" style="padding: 15px; margin: 0px; border: 1px solid #dde2e6; outline: 0px; vertical-align: baseline; color: #53555b; overflow-y: hidden; overflow-x: auto; line-height: normal !important; width: 886px !important; font-stretch: normal !important; font-family: Lato, Arial, Helvetica, sans-serif !important; background: transparent;"> <div class="scroll-pane1" style="padding: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; background: transparent;"> <div style="padding: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; background: transparent;">Height (h) of conical tent = 8 m<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp; Radius (r) of base of tent = 6 m<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp; Slant height (l) of tent =&nbsp;<img class="Wirisformula" style="padding: 0px; margin: 0px; outline: 0px; vertical-align: middle !important; background: transparent;" title="Double click to edit" src="https://images.topperlearning.com/topper/bookquestions/1172_b07db2a138b9cd3d76896950b166e7cb.png" alt="" align="middle" />&nbsp; &nbsp;&nbsp;&nbsp;<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp; CSA of conical tent =&nbsp;<img class="Wirisformula" style="padding: 0px; margin: 0px; outline: 0px; vertical-align: middle !important; background: transparent;" title="Double click to edit" src="https://images.topperlearning.com/topper/bookquestions/1172_6a426bd6d4839843b6a811138e3d6b88.png" alt="" align="middle" />&nbsp;= (3.14&nbsp;<img class="Wirisformula" style="padding: 0px; margin: 0px; outline: 0px; vertical-align: middle !important; background: transparent;" title="Double click to edit" src="https://images.topperlearning.com/topper/bookquestions/1172_b9ccb383b0c73c26cfb3ff194a86e235.png" alt="" align="middle" />&nbsp;6&nbsp;<img class="Wirisformula" style="padding: 0px; margin: 0px; outline: 0px; vertical-align: middle !important; background: transparent;" title="Double click to edit" src="https://images.topperlearning.com/topper/bookquestions/1172_b9ccb383b0c73c26cfb3ff194a86e235.png" alt="" align="middle" />&nbsp;10)&nbsp;<img class="Wirisformula" style="padding: 0px; margin: 0px; outline: 0px; vertical-align: middle !important; background: transparent;" title="Double click to edit" src="https://images.topperlearning.com/topper/bookquestions/1172_20eb865cc04235a6c2d39ab1fefc1bd5.png" alt="" align="middle" />&nbsp;= 188.4&nbsp;<img class="Wirisformula" style="padding: 0px; margin: 0px; outline: 0px; vertical-align: middle !important; background: transparent;" title="Double click to edit" src="https://images.topperlearning.com/topper/bookquestions/1172_20eb865cc04235a6c2d39ab1fefc1bd5.png" alt="" align="middle" /><br style="padding: 0px; margin: 0px;" /><br style="padding: 0px; margin: 0px;" />Let length of tarpaulin sheet required be L.&nbsp;<br style="padding: 0px; margin: 0px;" />As 20 cm will be wasted so, effective length will be (L - 0.2 m)&nbsp;<br style="padding: 0px; margin: 0px;" />Breadth of tarpaulin = 3 m&nbsp;<br style="padding: 0px; margin: 0px;" /><span style="background-color: #888888;">Area of sheet = CSA of tent&nbsp;</span><br style="padding: 0px; margin: 0px;" /><span style="background-color: #888888;">&nbsp;&nbsp;&nbsp; [(L - 0.2 m)&nbsp;<img class="Wirisformula" style="padding: 0px; margin: 0px; outline: 0px; vertical-align: middle !important; background: transparent;" title="Double click to edit" src="https://images.topperlearning.com/topper/bookquestions/1172_b9ccb383b0c73c26cfb3ff194a86e235.png" alt="" align="middle" />&nbsp;3] m = 188.4&nbsp;<img class="Wirisformula" style="padding: 0px; margin: 0px; outline: 0px; vertical-align: middle !important; background: transparent;" title="Double click to edit" src="https://images.topperlearning.com/topper/bookquestions/1172_20eb865cc04235a6c2d39ab1fefc1bd5.png" alt="" align="middle" /></span><br style="padding: 0px; margin: 0px;" /><span style="background-color: #888888;">&nbsp;&nbsp;&nbsp; L - 0.2 m = 62.8 m</span><br style="padding: 0px; margin: 0px;" /><span style="background-color: #888888;">&nbsp;&nbsp;&nbsp; L = 63 m</span><br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;<br style="padding: 0px; margin: 0px;" /><span style="background-color: #888888;">&nbsp;&nbsp;&nbsp; Thus, the length of the tarpaulin sheet will be 63 m.</span></div> <div style="padding: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; background: transparent;">&nbsp;</div> <div style="padding: 0px; margin: 0px; border: 0px; outline: 0px; vertical-align: baseline; background: transparent;">elaborate last 2 points</div> </div> </div> </div> </div> </div>
Asked by Gajanan | 07 Dec, 2014, 01:59: PM
Expert Answer
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Answered by Prasenjit Paul | 08 Dec, 2014, 10:26: AM
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