A: ### Quick Answer

**Two angles that have the sum of 180 degrees are supplementary angles.** Given one supplementary angle A, a person can find the other supplementary angle B by subtracting A from 180 degrees.

If one of the supplementary angles is 40, then the other supplementary angle is 180 – 40, or 140 degrees. When added together, two supplementary angles also form a straight angle; thus, a straight angle is also equal to 180 degrees.

In geometry, there are other different types of angles besides supplementary angles, such as acute and obtuse angles. While an acute angle is less than 90 degrees, an obtuse angle is more than 90 degrees but less than 180 degrees. In the example given above, the 40-degree angle is an acute angle, and the 140-degree angle is an obtuse angle.

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- Q:
## What is a quadrangle with two pairs of parallel lines and all right angles called?

A:Two types of geometric quadrilaterals, rectangles and squares, have two pairs of parallel lines and four right angles. In terms of these two shapes, they differ in that a square's sides are all equal length, whereas a rectangle generally has one longer pair and one shorter pair.

Full Answer >Filed Under: - Q:
## What is a ray that divides an angle into two congruent angles called?

A:

Full Answer >**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.Filed Under: - Q:
## Does a trapezoid have right angles?

A:

Full Answer >**A trapezoid may have right angles, but they are not required.**The definition of a trapezoid only specifies that it must be a quadrilateral, or a closed, four-sided shape, and that it must have only one pair of parallel sides.Filed Under: - Q:
## Does a rhombus have right angles?

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Full Answer >**Most rhombuses do not have right angles, but a square is technically a rhombus and does have right angles at each of its corners.**A rhombus is defined by having four sides of equal length, where opposite sides run parallel to each other, and opposite angles are equal. A square fulfills all these conditions.Filed Under: