Question

Use the diagram of ABCD to find m

Answer 1

51 degrees

Explanation:

Using the corresponding angle theorem we get that 129 + m = 180. m = 180-129=51

Answer 2

The measure of ∠D in the parallelogram without the degree symbol is 51.

What is the measure of ∠D?

Adjacent angles of a parallelogram are supplementary

So,

∠C + ∠D = 180° supplementary angles

129° + ∠D = 180°

Subtract 129 from both sides

∠D = 180° - 129°

∠D = 51°

Therefore, angle D equals 51°