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alina1380 [7]
3 years ago
10

Can someone help me

Mathematics
1 answer:
worty [1.4K]3 years ago
7 0

Answer:

B = 129

Step-by-step explanation:

Opposite angles of a parallelogram are equal (or congruent)

A and C are both 51.

All angles in a parallelogram equal 360

Take both the known angles and substract from 360, than divide by 2.

B = (360 - 51 - 51)/2

B = 129

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