# Discovery Activity - Quadrilaterals & Isosceles Trapezoids

What is the sum of the angles?

What is the sum of all the angles?

What do you notice about angles A and B?

What do you notice about angles A and D?

What is the sum of angles B and C?

What do you notice about angles C and D?

Is side AB parallel to DC? Explain

Is side AD parallel to BC? Explain

What do you notice about the of the sides of the figure?

What do you notice about the angles?

Why do you think only one pair of angles is congruent?

If the second diagonal was drawn to connect A to C, which pair of angles do you think would be congruent? Verify your answer on the figure below by measuring the angles.

Are the diagonals congruent?

Do the diagonals bisect each other?

What kind of triangles are AEB and DEC? Explain.

Summarize the information you learned about Isosceles Trapezoids. Create a way to present this to the class.