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Concept

Isosceles Triangle Thm If… 2 legs congruent Then…2 base angles congruent Converse Isosceles Triangle Thm If…2 base angles congruent Then…2 legs congruent

Example 1a

A. ∠PJM ≅ ∠PMJ

B. ∠JMK ≅ ∠JKM

C. ∠KJP ≅ ∠JKP

D. ∠PML ≅ ∠PLK

A. Which statement correctly names two congruent angles?

Example 1b

B. Which statement correctly names two congruent segments?

A. JP ≅ PL

B. PM ≅ PJ

C. JK ≅ MK

D. PM ≅ PK

Example 2a

A. 30°

B. 45°

C. 60°

D. 65°

A. Find m∠T.

Concept

If Equilateral…Then Equiangular If Equilateral… Then All Angles 60 degrees

Example 3

A. x = 20, y = 8

B. x = 20, y = 7

C. x = 30, y = 8

D. x = 30, y = 7

Find the value of each variable.

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