Question

20. Find the unknown angle measures.
51°
53°

Answer 1

Explanation:

Let assume as a=x, b=x, c=xand d=x

X+x+x+x+51+53=360 (sum of angles in circle)

4x+104=360

4x=360-104

4x/4=256/4

X=64

The values of the unknown angels =64

PROVE

64+64+64+64+104=360

256+104=360

360=360

Answer 2

Explanation:

'a' is equal to the angle opposite it = fifty one

'c' " " " " " " " = fifty three

'd' and 'b' are equal

'c' 'd' and 'a' form a straight line = 180

fifty three + fifty one + d = 180 shows d = seventy six degrees