General
General
Easy

Question

Write a coordinate proof.
GIVEN: △ ABD is a right triangle, with the right angle at vertex A. Point C is the midpoint of hypotenuse BD.PROVE: Point C is the same distance from each vertex of △ ABD.

hintHint:

Prove using congruence criterion.

The correct answer is: the midpoint of the hypotenuse is equidistant from the vertices


    Complete step by step solution:
    Let ABD be the right triangle right angled at A. Here BD is the hypotenuse and
    C is the midpoint of the hypotenuse so that BC= DC.
    ∠DAB = 90°

    By the converse of the midpoint theorem, P is the midpoint of AD.
    ∠DPC = ∠DAB  = 90°(since PC ∥ AB)
    Consider  ⃤  DPC and  ⃤  APC,
    DP = AP (since P is the midpoint)
    ∠DPC = ∠APC  = 90°
    CP = CP (common side)
    ∴ ⃤  DPC and  ⃤  APC are congruent by SAS congruence criterion.
    ⇒ DC = AC  (corresponding parts of congruent triangles)
    Hence, DC = AC = CB
    So, proved that the midpoint of the hypotenuse is equidistant from the vertices.

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