Half of the third side., In Theorem 5, what is the measure of the midline of a triangle compared to the measure of the third side?, It is congruent., In Theorem 9, what can you say about the diagonals of an isosceles trapezoid?, It is supplementary., In Theorem 2, what can you say about the opposite angles of an isosceles trapezoid?, It is length is one half the sum of the lengths of the bases., In Theorem 6, what is the measure of the midsegment of the trapezoid?.

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