Given: .

Prove:

(1) . GIVEN

(2) REFLEXIVE PROPERTY OF CONGRUENCE

(3) ASA POSTULATE

Given:

Prove:

(1) GIVEN

(2) THE BASE ANGLES OF AN ISOSCELES TRIANGLE ARE CONGRUENT

(3) DEFINITION OF ALTITUDE OF A TRIANGLE

(4) are right angles. PERPENDICULAR LINES MEET TO FORM RIGHT ANGLES.

(5) ALL RIGHT ANGLES ARE CONGRUENT

(6) REFLEXIVE PROPERTY OF CONGRUENCE

(7) AAS Theorem