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You must use the formulas you know that describe the properties of triangles

to relate the information you're given to the size of the unknown angle.

Do you want to know the measurement / size of the angle.

The internal angles of a triangle add up to 180 degrees. If you know two angles then add them together

eg 60 + 30 = 90 now subtract 90 from 180, 180-90 = 90

So the missing angle is 90 degrees

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Q: How do you find a missing angle on a triangle?
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