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    Sarah01's Avatar
    Sarah01 Posts: 11, Reputation: 1
    New Member
     
    #1

    Jan 30, 2008, 03:29 PM
    Postulate or theorem
    Consider triangles ABC and DEF. Side a is congruent to side f. Angle A is congruent to angle F. Angle B is congruent to angle E. What postulate or theorem can be used to prove that the two triangles are congruent?
    jiten55's Avatar
    jiten55 Posts: 105, Reputation: 8
    Junior Member
     
    #2

    Jan 30, 2008, 04:59 PM
    B = E, A = F

    Hence C = D (Because A + B + C = D + E + F = 180 degrees)

    A = F, a = f,

    Hence triangles are congruent.

    When 3 corresponding angles are equal, and a = f (Sides opposite to equal angles), triangles are congruent.

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