Prove Proposition 20 using a different construction. First, bisect one of the angles of the triangle. This will create two triangles. Then apply the exterior angle theorem to one of the two triangles.

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A: Since you have asked multiple question, we will solve the first question for you as per our guide…

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A: To determine the condition so that the given triangles become congruent according to ASA.

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A: We know Sum of all interior angles of triangle is 180°

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A: NOTE: Refresh your page if you can't see any equations. . dimension of the triangle A  length=55 and…

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A: Please see the below picture for detailed solution.

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A: Find the missing term in the proof.

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A: We can find the sides of the triangle using the given  data in the below steps.

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A: Given figure:-

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Q: Find the measure of ONE interior angle in a regular 20-gon. degrees

A: NOTE: Refresh your page if you can't see any equations. . for polygon, the measure of each interior…