A 2D shape that has all but one right angle is called a trapezoid (or trapezium in some regions). Specifically, this shape has at least one pair of parallel sides, and only one of its angles is not a right angle, while the others are 90°.

To describe it clearly:

• The trapezoid has two parallel sides.
• Three of the angles are right angles (90°).
• One of the angles is not a right angle (can be less than or greater than 90°).

Would you like to see a drawing of this shape?

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Here are five related questions to expand on this topic:

1. What is the difference between a trapezoid and a parallelogram?
2. How do you calculate the area of a trapezoid?
3. What types of quadrilaterals always have right angles?
4. Can a trapezoid be classified as a rectangle? Why or why not?
5. How does the length of the parallel sides affect the trapezoid's properties?

Tip: To calculate the area of a trapezoid, you need the lengths of the parallel sides and the height.