Question

Please help! show me how to do this

Answer 1

says that the triangles ABC and DEF are congruent, but moreover that the corresponding angle pairs (A, D), (B, E), and (C, F) are congruent.

This means
`m\angle A=m\angle D`, so

`(x+17)^\circ=2x^\circ\implies x=17`

so that
`m\angle A=17^\circ+17^\circ=34^\circ` and
`m\angle D=2*17^\circ=34^\circ`.