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umka21 [38]
3 years ago
13

A and B are vertical angles. If m_A = (3x - 30)° and m

Mathematics
1 answer:
Vilka [71]3 years ago
4 0
<h3>Answer:  21</h3>

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

Work Shown:

Vertical angles are always congruent.

This means they are equal in measure.

A = B

3x-30 = 2x-9

3x-2x = -9+30

x = 21

--------

Side note:

if x = 21, then,

A = 3*x-30 = 3*21-30 = 33 degrees

B = 2*x-9 = 2*21-9 = 33 degrees

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