![]() Now that it has been proven, you can use it in future proofs without proving it again.Ĭlick the small blue arrow next to the image below and then drag the orange vertices to reshape the triangle. ![]() Try the free Mathway calculator and problem solver below to practice various math topics. Proof 2: The diagonals of a rhombus are perpendicular. This amounts to be a triangle proof to use CPCTC. We need to prove that the angles corresponding to the sides AC and BC are equal, that is, CAB CBA. Proof 1: The diagonals of a rectangle are congruent. Proof: Assume an isosceles triangle ABC where AC BC. ![]() The statement "the measure of an exterior angle of a triangle is equal to the sum of the measures of the remote interior angles" is the Exterior Angles Theorem. This video uses the two column method to prove two theorems.
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