In parallelogram ABCD, AC is a diagonal, the measure of ∠ABC is 40°, and the measure of ∠ACD is 57°. What is the measure of ∠CAD?
Since ∠ABC is 40°, then ∠ADC is also 40°.
Subtract 57° and 40° from 180, and that will be the measure of ∠CAD, because angles of a triangle add up to 180°. 180  (57 + 40) {subtracted the two known angles of the triangle from 180} = 180  97 = 83 D.) 83° Ask Algebra House Comments are closed.

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