Unit 4 Vocabulary

Front

Adjacent angles

Back

Two angles that are next to each other and share a side.

Front

Area of a circle

Back

The space inside a circle, found using the formula A = rac{1}{2} imes ext{base} imes ext{height} (where r is the radius).

Front

Circumference

Back

The distance around a circle, like the "perimeter" of a circle. The formula is C = 2 ext{π}r or C = ext{π}d (where r is the radius and d is the diameter).

Front

Composite figures

Back

Shapes made up of two or more simple shapes, like rectangles, triangles, or circles.

Front

Congruent

Back

Shapes or angles that are exactly the same size and shape.

Front

Irregular polygon

Back

A shape with straight sides where the sides or angles are not all the same.

Front

Parallel lines

Back

Lines that run in the same direction and never cross.

Front

Pi

Back

A special number (about 3.14) used in math to calculate circles.

Front

Regular polygon

Back

A shape with straight sides where all the sides and angles are the same.

Front

Right rectangular prisms

Back

A 3D box shape with 6 rectangle-shaped faces (like a shoebox).