91Ó°ÊÓ

Consider the diagrams.

If two triangles are congruent, part of corresponding triangles are equal.

Since the two triangles are congruent thus the part of corresponding triangles is equal and $\mathrm{Δ}ARTâ‰\dots \mathrm{Δ}DEB$ thus$\mathrm{Δ}EBDâ‰\dots \mathrm{Δ}RTA$ .

Therefore, the answer is$\mathrm{Δ}RTA$ .

Consider the diagrams.

If two triangles are congruent, part of corresponding triangles are equal.

Since the two triangles are congruent thus the part of corresponding triangles is equal and $\mathrm{Δ}ARTâ‰\dots \mathrm{Δ}DEB$ thus$\stackrel{¯}{AT}â‰\dots \stackrel{¯}{DB}$ .

Therefore, the answer is$\stackrel{¯}{AT}â‰\dots \stackrel{¯}{DB}$ .

Consider the diagrams.

If two triangles are congruent, part of corresponding triangles are equal.

Since the two triangles are congruent thus the part of corresponding triangles is equal and $\mathrm{Δ}ARTâ‰\dots \mathrm{Δ}DEB$ thus$m∠Râ‰\dots m∠E$ .

Therefore, the answer is$m∠Râ‰\dots m∠E$ .