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3 years ago

I need to know how to solve this and the answer

Mathematics

2 answers:

Gemiola [76]3 years ago

8 0

Answer:

69°

Step-by-step explanation:

180 - 21 -90 = 69

hope this helps...

N76 [4]3 years ago

8 0

Answer: The missing angle is 69°

Step-by-step explanation: When all the angles have their vertex on a straight line, they must add up to 180° They are "supplementary" angles.

The "box" in the corner of an angle is a symbol for "right angle" so that is a way to have a "given" 90°

Knowing that, you can add the "given" 90° + 21° to get 111°

Subtract 111° from 180° to find Angle a:

180 - 111 = 69

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