Proofs for Isosceles Trapezoids


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question 1 of 3

What is the length of AC in the given isosceles trapezoid, given that BD = 10 cm?

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1. In the given isosceles trapezoid, what is the length of BC?

2. In the given isosceles trapezoid, what is the measure of angle C?

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About This Quiz and Worksheet

Isosceles trapezoid proofs are the focus for this combination of a quiz and worksheet. You can find questions on calculating the length of a side, as well as the sum of opposite angles.

Quiz and Worksheet Goals

Questions in the quiz will address the following material:

  • Finding the length of one side, given the length of another side of an isosceles trapezoid
  • Determining the measure of an angle in a given trapezoid
  • Finding the angle in another trapezoid
  • Recognizing the sum of opposite angles

Skills Practiced

  • Defining key concepts - ensure that you know the sum of opposite angles in an isoceles trapezoid
  • Information recall - remember what you know about finding the angles in a given trapezoid
  • Problem solving - use your skills to solve practice problems involving finding the length of sides in a trapezoid

Additional Learning

For some more practice, open the lesson titled Proofs for Isosceles Trapezoids. Inside, you can find the following extra topics:

  • Defining an isosceles trapezoid
  • Base angles
  • Diagonals
  • Formulas to use