Mathematics (8th grade)

Cynthia is finding the measures of the labeled angles in this image.

A triangle has angles B, C, D. The exterior angle to angle B is A.

What is the least number of angle measures she needs to know to find the measures of all labeled angles in the image?

She only needs to know the measure of one angle, angle D.
She only needs to know the measure of one angle, angle A.
She only needs to know the measures of two angles, angles A and B.
She only needs to know the measures of two angles, but one of the angles must be one of the remote interior angles.
think the answers d

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  1. Is the answer d right?

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  2. D looks good to me

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  3. ok

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    2. 👎

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