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ICSE Class 9 Answered

In the right angled triangle ABC,angle C=90 degrees and angle B=60 degrees.If AC=6cm,find the lengths of the sides BC and AB  (Hint:Use the concept of trigonometry)
Asked by laxmi.agarwal055 | 21 Feb, 2018, 19:17: PM
answered-by-expert Expert Answer
begin mathsize 16px style In space increment PQR comma angle straight Q equals 90 degree comma space angle straight R equals 60 degree space and space PQ equals 6 space cm tan 60 degree equals PQ over QR square root of 3 equals 6 over QR QR equals fraction numerator 6 over denominator square root of 3 end fraction space cm equals 2 square root of 3 space cm sin 60 degree equals PQ over PR fraction numerator square root of 3 over denominator 2 end fraction equals 6 over PR PR equals fraction numerator 12 over denominator square root of 3 end fraction equals 4 square root of 3 space cm end style
Answered by Sneha shidid | 22 Feb, 2018, 12:09: PM

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