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Quadrilateral ABCD ​ is inscribed in this circle.

What is the measure of angle C?

Enter your answer in the box.



Quadrilateral ABCD ​ is inscribed in this circle. What is the measure of angle C? Enter-example-1
User Soundmaven
by
3.2k points

2 Answers

16 votes
16 votes

Answer:

62°

i took the test and this is the right answer

User Mizbah Ahsan
by
3.6k points
18 votes
18 votes

Answer:

m∠C = 122°

Explanation:

Opposite angles of a quadrilateral inscribed in a circle are supplementary. This means

m∠A + m∠C = 180°

m∠B + m∠D = 180°

To find angle C we need to find x, then subtract m∠A from 180°

x+20=3x

20=2x

x=10

Now we substitute 10 in for x

m∠A=2(10)+38

m∠A=20+38

m∠A=58°

Now we subtract this value from 180.

m∠C=180-58

m∠C=122°

User Vincent Marchetti
by
2.5k points