Q:

# Which quadrangle has at least one right angle?

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Almost any quadrangle can contain at least one right angle, including trapezoids, kites, rectangles and squares. Rectangles and squares contain four right angles. The opposite sides of rectangles are parallel and of equal length. The opposite sides of squares are also parallel, and each side is the same length.

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Squares and rectangles are subsets of parallelograms and rhombuses. However, if a parallelogram or rhombus contains a right angle, it is defined as a rectangle or square, depending on the side lengths.

It is also possible for trapezoids to contain two right angles. Trapezoids are quadrilaterals that have one pair of sides that are parallel, with the other sides not parallel. The angles of trapezoids can vary greatly.

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## Related Questions

• A:

A ray that divides an angle into two congruent angles is called an angle bisector. The straight line cuts an angle in half, creating two equal angles.

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• A:

A trapezoid is a quadrangle that is not a parallelogram. A trapezoid is a quadrangle because it has four sides and four internal angles, but it is not a parallelogram because it only has one pair of parallel sides rather than two.

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Angle measurement as it pertains to studying mathematics is accomplished using a protractor, the center of which is lined up with the intersection of the angle to be measured. One line of the triangle is lined up with the bottom line of the protractor and the other line gives the angle.