Find the following

Question

If the vertex angle, of an isosceles triangle, is 40 degrees and the base side (side opposite vertex angle) is 10 inches. Find the following.

a) find the measure of the base angles.

b) find the exact values of sine and cosine of one of the base angles.

Answer 1

Draw and label a diagram!

a) base angle = (180° - 40°) / 2

b) sin 70° ≈ 0.93969262

cos 70° ≈ 0.342020143