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# What are irregular shapes?

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Irregular shapes are those with sides of different lengths and angles that are unequal. Regular shapes have sides with equal lengths and have angles of the same size.

## Keep Learning

Shapes like squares and equilateral triangles are considered regular shapes because they have predictably identical sides and angles. If a person were to take an equilateral triangle and make each of the sides different lengths and change the size of each angle, the regular-shaped triangle would turn into an irregular shape. Irregular shapes do not have to look messy or weird, though; a shape that resembles a rectangle with a chunk cut out of it can be considered irregular, even though it is composed of straight lines and has a neat and orderly appearance.

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## Related Questions

• A:

The angles that lie on the exterior of the intersection created on opposite sides of a paired set of intersecting lines are alternate exterior angles. If the two intersecting lines are parallel, the alternate exterior angles are congruent.

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Three laws can be used to find the sides and angles of almost any triangle: the Law of Angles, the Law of Sines, and the Law of Cosines. The Law of Angles means that all three angles of a triangle add up to 180 degrees. The Law of Sines is that the ratio of each side to the sine of its opposite angle is equal: a/sin(A) = b/sin(B) = c/sin(C). The Law of Cosines works when all sides are known.

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A square is always a rhombus because it satisfies the definition of a rhombus, which is any figure with four equal sides, equal opposite angles and two pairs of parallel lines. A rhombus can sometimes be a square.