Question

prove that tri.def = tri.pqr

Answer 1

Oye!!

tri.def is not congruent to tri.pqr, instead

tri.abc = tri.def

This is done by ASA congruence axiom.

Answer 2

EF=QR(each 2cm)
angle DEF=angle PQR(each 30°)
angle DFE=angle QPR (each 80°)
by ASA congruence rule,it is proved that triangle DEF is congruent to triangle PQR.
As we know that every congruent triangle is equal to each other .
So triangle DEF is equal to triangle PQR.
hope it helps you.
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