2 because ∠ 1=∠2 (known), AO=BO (known), OP=OP (male * * * side), so △AOP and △BOP are congruent.

3 ( 1)AB=FD (2)∠B=∠E。

4 Because AB=AC, so ∠B=∠C (equilateral and equiangular).

Because AB = AC, ∠ B = ∠ C, Co = Bo, △ABD and △ACBE are congruent.

5 Because ∠A=∠D (known), CO=BO (known), ∠COA=∠BOD (opposite vertex angle). So △AOC congruence and△ △DOB.

6△AED is all equal to △ △AFD.