Question

prove that sin 60 in geometrically

Answer 1

First take a 60-60-60 triangle, arm length of 2unit.

then from the vertex, Devide the triangle into two equal parts, So two angle will be formed of 30-90-60 & arms will be 2-1-root(3)

Now apply sine formula as

SIN THEETA = P/H

Sin(30) = 1/2

Answer 2

this is given in R.D. Sharma on Page no.5.29