# vs.eyeandcontacts.com

## Measures and Measurement Terms

Acute angle: An angle that measures between 0º and 90º.

Angle: The measure of the space between two straight lines that extend from a common point.

Area: The size of space a surface takes up.

Capacity: The amount a container can hold.

Circumference:
The distance around the outer edge of a circle.

Complementary angles: Two angles whose sum is 90°.

Degree: A unit for measuring the size of angles.

Dimensions: The lengths of the sides of a shape. Refers to length, breadth and height.

Interval:
•  The distance between two points.
• The amount of time that has passed between two events

Mass: A measure of the amount of matter in an object.

Minute: A unit of time. There are 60 minutes in one hour. There are 60 seconds in one minute.

Obtuse angle: An angle that is greater than 90° and less than 180°.

Opposite angles: Angles that are vertically opposite.

Perimeter: The distance around the boundary of a shape.

Reflex angle: An angle that is greater than 180° but less than 360°.

Right angle: An angle which measures 90º.

Straight angle: An angle which measures 180º.

Supplementary angles: Two angles whose sum is 180°.

Total surface area: The total area of all the faces (and curved surfaces) of a solid figure.

Volume: The amount of space occupied by a 3-dimensional object.

Year: A unit of time. There are 365 days in one year. There are 12 months in one year.