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23 votes
23 votes
What is the measure of

What is the measure of-example-1
User Fluffysheap
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1 Answer

29 votes
29 votes

Answer:

  • 39°

Explanation:

∠ABC is marked as right angle, 90°.

∠ABD and ∠CBD are complementary angles, so their sum is 90°.

  • m∠ABD = 90° - m∠CBD = 90° - 51° = 39°
User Jeremy Haberman
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3.2k points