Vocabulary Review

Vocabulary Review By Megan Stussi, Eric Wilkinson and Jesse Walker Terms and Diagrams taken from “Harcourt Multimedia Math Glossary” http://www.harcourtschool.com/glossary/math_advantage/glossary6.html

Angle • A geometric figure formed by two rays that have a common endpoint D Angle E F

Arc • A portion of a circle • A semicircle is an arc that is one-half of a circle.

Circumference • The distance around a circle • C = 2π x r d r or C = π x d

Area • The size of a surface • The number of square units needed to cover a given surface • Example: The area is 9 square units. 4 1 2 3 5 6 7 8 9

Area • Square A = side x side • Rectangle A = base x height A = length x width • Triangle A = ½ (base x height) s s h b h b

b b 2 1 Area • Trapezoid A = ½ (base1 + base2) x height • Circle A = π x radius2 h r

Volume • The number of cubic units needed to occupy a given space • Volume of a cube: volume= side3 • The volume of the cube is 8 cubic units. • Volume of a rectangular prism: V = (length) (width) (height) h l w

Chord • A line segment connecting two points located on the circle.

Coordinate Plane • A plane formed by a horizontal line (x-axis) that intersects a vertical line (y-axis) at a point called the origin

Radius • A line segment with one endpoint at the center of a circle and the other endpoint on the circle radius

b a Diameter • A line segment through the center of a circle, with endpoints on the circle • Equal to twice the radius • ab is a diameter of the circle.

Perimeter • The distance around a polygon • Perimeter = side1+ side2 + side3….. • P = 2 cm + 3 cm + 3 cm = 8 cm • Perimeter of a square: p= 4 x side • Perimeter of a rectangle: p= 2b + 2h

Pi π • The ratio of the circumference of a circle to the length of its diameter • Pi ≈ 3.14 Or Pi ≈ 3.14159265358979323846264338327950288419716939937510… (to the first 50 decimal places)

Quadrilateral • A four-sided polygon • Examples:

Vocabulary Review