#1**0 **

Hint: If one side of an inscribed triangle passes through the center of a circle, the other two sides are the legs of the right-angled triangle.

Guest Aug 14, 2020

#2**0 **

It's clear that angle A is 90 and so is angle B. So, angle D is 20, and angle C is 50.

Hope this helped!

OlympusHero Aug 14, 2020