Given: ABCD is a parallelogram.
Prove: m∠A + m∠B + m∠C + m∠D = 360˚
Parallel...
Mathematics, 11.04.2020 02:45 officialrogerfp3gf2s
Given: ABCD is a parallelogram.
Prove: m∠A + m∠B + m∠C + m∠D = 360˚
Parallelogram A B C D is shown.
By the definition of a parallelogram, AD∥BC and AB∥DC. Using, AD as a transversal, ∠A and ∠are same-side interior angles, so they are . By the definition of supplementary, m∠A + m∠D = 180. Using side as a transversal, ∠B and ∠C are same-side interior angles, so they are supplementary. By the definition of supplementary, m∠B + m∠C = 180. So, m∠A + m∠D + m∠B + m∠C = 180 + 180 by the property. Simplifying, we have m∠A + m∠B + m∠C + m∠D = 360˚.
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