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3 years ago

PLEASE HELP!!! If m<B=m<D=42 find m<c so that quadrilateral ABCD is a parallelogram

Mathematics

1 answer:

MissTica3 years ago

8 0

The oposite angles must be equal and adjacent angles must be supplementary

so
D=B and A=C
and
A+D=180=A+B=B+C=C+D
so ifD=42, then

A+D=180
A+42=180
minus 42 both sides
A=138=C

angle C has to be 138 degrees

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