Question

Please answer! Best answer will be marked brainliest!​

Answer 1

Step-by-step explanation:

3) angle BAC = 90( since angle in a semi circle)

so angle z = 180-90-20= 70

4)

same angle in the semi circle

so a = 180-90-62= 28

b) given that angle ABC = 30

triangle oab is a isosceles triangle with OA = OB (radius)

so angle OAB = 30

so angle BOA = 180-30-30= 120

so angle AOC = 180-120= 60 (LINEAR PAIR)

and we know that OA = OC radius so remaining angles are add up-to 120 and they are equal so each angle will be 60

so triangle OAC is equilateral triangle