Will give complete the sentence with the phrase that makes the proof statement true. wxy is an isosceles triangle. side wx and side yx are congruent a. because all of the sides of an isosceles triangle are congruent. b. by the definition of isosceles triangle. c. because vertical angles are congruent. d. and all of the angles of the triangle are congruent to each other as well.

B. by the definition of isosceles triangle.

Step-by-step explanation:

Definition of Isosceles triangle : IT is a special kind of triangle that has two sides of equal length or two angles of equal measure.

Thus , if a isosceles triangle is given then its two sides must be congruent.

Given : WXY is an isosceles triangle.

Side WX and side YX are congruent by the definition of isosceles triangle.

Hence the correct answer is option B. " by the definition of isosceles triangle."

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