Stan knows that segment AB∥segment CD. He wants to use the definition of a parallelogram to prove that quadrilateral ABCD is a parallelogram. Which equation can he use?

Step-by-step explanation:

Given

See attachment for parallelogram

Required

Proof that ABCD is a parallelogram

We know that opposite sides are equal and parallel.

First, we calculate the slope of BC

So, we have:

Next, the slope of AD using:

So, we have:

For ABCD to be a parallelogram; then:

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the anwser is d) 75°

step-by-step explanation: