### Home > A2C > Chapter Ch4 > Lesson 4.2.4 > Problem4-126

4-126.
1. Find the value of x. Homework Help ✎

Use the Pythagorean Theorem.

x = ± 21

Use the positive side length.

See part (a).

$\textit{x}=10\sqrt{5}\approx22.3607$

You can use special triangles 30-60-90 and 45-45-90, or solve by using the Law of Sines.

x = 50 Remember to check your work.