Question

Help:( Have to submit homework in 25 minutes!
In a triangle ABC, a = 62 cm, b = 62 cm, and A = 71°. The length of c is?

Answer 1

looks like you have an isosceles triangle, so angle B= angle A
now you can find angle C
now you know enough to use the Law of sines

Answer 2

draw a diagram


the triangle is isosceles and angle C = 38 by angle sum of a triangle

use the cosine rule

\[c^2 = 62^2 + 62^2 - 2\times 62 \times 62 \times \cos(38)\]