use trigonometric ratios and the Pythagorean theorem to solve the triangle.

Question

h ttps://upload.wikimedia.org/wikipedia/commons/6/6f/Rtriangle.svg

c = 31.0 cm
a = 13.6 cm

Answer 1

we can find b using Pythagoras
a^2 + b^2 = c^2
13.6^2 + b^2 = 31^2
solve for b

sinA = 13.6/31 = .438709...
angle A = appr 26°
then angle B = 90-26 or 64°
of course angle C = 90°

Answer 2

thanks reiny