21.ABCD is a rectangle

m<1=
m<2=
m<3=
m<4=
m<5=
m<6=
m<7=


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Answer:

Since each pair of opposite sides of the quadrilateral have the same measure, they are congruent. Quadrilateral ABCD is a parallelogram. The length of each diagonal is 130. Since the diagonals are congruent, ABCD is a rectangle by Theorem 6.14.

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