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CBSE Class 10 Answered

circular park of radius 20m is situated in a colony. Three boys Ankur, Syed and David re sitting at equal distance on its boundary each having a toy telephone in their hand to talk each other. Find the length of the string of each phone  
Asked by gujarsurjeet007 | 21 Feb, 2018, 10:29: PM
answered-by-expert Expert Answer
 
begin mathsize 16px style Given comma space AB equals BC equals AC Let space AB equals BC equals AC equals straight a Let space height space of space triangle space ABC equals AD equals straight h Radius space of space circular space park space left parenthesis circumcircle right parenthesis equals straight R equals 20 space straight m Now comma space OA equals 2 over 3 AD rightwards double arrow straight R equals 2 over 3 straight h straight h equals fraction numerator square root of 3 over denominator 2 end fraction straight a rightwards double arrow straight R equals 2 over 3 cross times fraction numerator square root of 3 over denominator 2 end fraction straight a equals fraction numerator 1 over denominator square root of 3 end fraction straight a rightwards double arrow straight a equals square root of 3 straight R equals 20 square root of 3 space straight m end style
Answered by Rashmi Khot | 22 Feb, 2018, 11:42: AM

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CBSE 10 - Maths
Please solve this question ?
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Asked by Vidushi412 | 11 Aug, 2020, 10:20: PM
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CBSE 10 - Maths
How to prove that opposite sides of a quadrilateral circumscribing a circle  subtend supplementary angles at the centre of the circle 
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CBSE 10 - Maths
Find area of shaded region
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Asked by tejutanu2004 | 16 Sep, 2019, 08:27: PM
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CBSE 10 - Maths
 Two circular pieces of equal radii and maximum area, touching each other are cut out from a rectangular card board of dimensions 14 cm 7 cm. Find the area of the remaining card board. Use pie=22/7
Asked by shailesh.solanki | 18 Mar, 2018, 07:29: PM
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CBSE 10 - Maths
In the figure, a square OABC is inscribed in a quadrant OPBQ. If OA = 20 cm, find the area of the shaded region.
Asked by Topperlearning User | 27 Jul, 2017, 02:33: PM
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CBSE 10 - Maths
The inside perimeter of a running track shown in the figure is 400 m. The length of each of the straight portions is 90 m, and the ends are semi-circles. If the track is 14 m wide every where, find the area of the track. Also, find the length of the outer boundary of the track.
Asked by Topperlearning User | 27 Jul, 2017, 02:33: PM
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CBSE 10 - Maths
Four equal circles are described about four corners of a square so that each touches two of the others, as shown in the figure. Find the area of the shaded region, if each side of the square measures 14 cm.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 10 - Maths
In triangle ABC, angle A = 90o, AB = 12 cm and BC = 20 cm. Three semi-circles are drawn with AB, AC and BC as diameters. Find the area of the shaded portion.
Asked by Topperlearning User | 27 Jul, 2017, 02:33: PM
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CBSE 10 - Maths
In the figure, ABC is an equilateral triangle of side 12 cm. The circle is centered at A with radius 6 cm. Find the area of the shaded region.
Asked by Topperlearning User | 27 Jul, 2017, 02:28: PM
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CBSE 10 - Maths
Find the area of the region ABCDEFA shown in the figure, given that ABDE is a square of side 10 cm, BCD is a semi- circle with BD as diameter, EF = 8 cm, AF = 6 cm and angle AFE = 90o.
Asked by Topperlearning User | 27 Jul, 2017, 02:33: PM
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