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Web the equilateral has a property with all three interior angles. Web isosceles and equilateral triangles date_____ period____ find the value of x. Web the equilateral has a property with all three interior angles. Web lesson worksheet course menu. You may construct an equilateral triangle of a. Web these ready to print task cards will make congruent triangle proofs a breeze! ∠ ≅∠d e a is the midpoint of db b is the midpoint of ae prove: Complete the proof by dragging and dropping to fill in the blanks in the two column proofs. Web the shape of an isosceles triangle, as shown in the accompanying diagram. Web proving triangles are congruent. Abc , ca cb≅ , ar bs≅ dr.