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Dafna11 [192]
3 years ago
11

(02.07)

Mathematics
1 answer:
Evgen [1.6K]3 years ago
4 0
<h3>Answer:  Choice B) 180 - x = r</h3>

===========================================================

Explanation:

Angles r and x form a straight line, or straight angle, that is 180 degrees.

We then can say

r+x = 180

r+x-x = 180-x .... subtract x from both sides

r = 180-x

180-x = r

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