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Mathematics 13 Online
OpenStudy (meilendurcer):

what is the measure of angle D?

OpenStudy (meilendurcer):

OpenStudy (anonymous):

Angle B is a rightt angle because of the square on the corner, so its 90 degrees, then you add the angles up so 90+39=129 since a whole triangle is 180 degrees, you do 180-129 and the answer is 51

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