Of ∆PRQ, ∆TRS, and ∆VSQ, which are congruent? How do you know?
By the way, ∆PTV is also a triangle.
∆TRS ≅ ∆PRQ because ∆PTV is isosceles, meaning ∠T ≅ ∠P. We can use SAS to prove congruence.
If AC ≅ DF, is it true that ∆ABC ≅ ∆DEF? How do you know?
What are the three postulates (and one theorem) we can use to prove triangle congruence?
Yes, ∆ABC ≅ ∆DEF because of the AAS theorem.
Is it true that ∆LMO ≅ ∆POM? How do you know?
They share a side, don't they?
Yes, ∆LMO ≅ ∆POM because of the AAS theorem.
Is it true that ∆LMO ≅ ∆MNP? How do you know?
An awful lot of these triangles are isosceles, aren't they?
Yes, ∆LMO ≅ ∆POM because of the AAS theorem and the Isosceles Triangle Theorem.
Prove that equilateral triangles have three angles of equal measurement.
Use the Isosceles Triangle Theorem. Twice.
Make it rain.
The who, what, where, when, and why of all your favorite quotes.
Go behind the scenes on all your favorite films.