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CBSE Class 11-science Answered

what is triangle of reference in  circular trignometry? explain with diagram.
 
Asked by lucky170313 | 04 Jun, 2014, 07:58: PM
answered-by-expert Expert Answer
C o n s i d e r space t h e space f o l l o i w i n g space f i g u r e.
I n space t r a i n g l e space A B C comma space r i g h t space a n g l e d space a t space B comma space l e t space theta space b e space t h e space a n g l e space angle A C B. T h u s comma space sin theta equals fraction numerator o p p over denominator h y p end fraction equals fraction numerator A B over denominator A C end fraction equals 1 half cos theta equals fraction numerator a d j over denominator h y p end fraction equals fraction numerator B C over denominator A C end fraction equals fraction numerator square root of 3 over denominator 2 end fraction tan theta equals fraction numerator o p p over denominator a d j end fraction equals fraction numerator A B over denominator B C end fraction equals fraction numerator 1 over denominator square root of 3 end fraction cos e c theta equals fraction numerator h y p over denominator o p p end fraction equals 2 over 1 s e c theta equals fraction numerator h y p over denominator a d j end fraction equals fraction numerator 2 over denominator square root of 3 end fraction c o t theta equals fraction numerator a d j over denominator o p p end fraction equals fraction numerator square root of 3 over denominator 1 end fraction a n d space theta equals 30 to the power of degree T h i s comma space t r i a n g l e space i s space c a l l e d space t h e space t r i a n g l e space o f space r e f e r e n c e space i n space c i r c u l a r space t r i g o n o m e t r y.
Answered by Vimala Ramamurthy | 05 Jun, 2014, 11:21: AM

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CBSE 11-science - Maths
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CBSE 11-science - Maths
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Kunal’s heart beats 72 times in one minute. If the length of second hand of watch is 4.5 cm. Find the distance travelled by the tip of second’s hand of watch when Kunal’s heart beats 300 times.
Asked by Topperlearning User | 31 May, 2016, 08:49: AM
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The speed of sound is nearly 341m/s, if a car of wheel radius 70 cm moves with a speed of sound. Find the number of revolutions it will make in 10 sec.
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CBSE 11-science - Maths
If in two circles,  arcs of same length, subtend angles 120o and 150o at the centre, find the ratio of their radii.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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