GM-U9.2 LC: Proving Polygons in the Coordinate Plane

Describe the steps used to prove the polygon a right triangle.

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Describe the steps used to prove the polygon a rectangle.

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Which of the following must be true for the triangle to be isosceles?

• AC = BC

• C = B

• A = C

• AB = BA

Which of the following must be true for the triangle to be equilateral?

• AC = BC

• AB = BC

Which of the following must be true for polygon ABCD to be a parallelogram?

Find and label the congruent acute angle to angle D and the congruent obtuse angle to A prove the polygon a parallelogram.

a

b

Find and label the congruent side to DC and the congruent side to AD prove the polygon a parallelogram.

a

b

Which of the following must be true for polygon ABCD to be a trapezoid?

Which of the following must be true for polygon ABCD to be a isosceles trapezoid?

Which of the following must be found to prove the perimeter of the triangle?