Question

Drag a statement or reason to each box to complete this proof.

Given: Quadrilateral ABCD with m∠A=(7x)°, m∠B=(5x)°, m∠C=(7x)°, and m∠D=(5x)°.


Prove: x = 15

Answer 1

2)
`m\angle A+m\angle B+m\angle C+m\angle D=360^(\circ)`

3) Substitution property

4) Combine like terms