## Chapter 9 - Course 2

##### Created by:

smacdermaid  on February 26, 2011

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# Chapter 9 - Course 2

 AreaThe number of units squares needed to cover a figure.
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#### Definitions

Area The number of units squares needed to cover a figure.
Circumference The distance around a circle.
Hypotenuse The side of a right triangle opposite the right angle.
The longest side of a right triangle.
Perfect square The square of a whole number. (Ex: 36 is a perfect square because 36 = 6²)
Perimeter The distance around a geometric figure.
Pythagorean Theorem a² + b² = c²
Square Root One of the two equal factors of a number.
(Ex: √(16) = 4 & -4
Perimeter Formula P = Sum of all sides
Circumference Formula C = (π)(d) or C = 2(π)r
Area of a Rectangle A = l(w)
Area of a Parallelogram A = b(h)
Area of a Triangle A = ½(b)(h) or A = (b*h)/2
Area of a Trapezoid A = (½)(h)(b1+b2)
Area of a Circle A = πr²
Leg The two sides that form the right angle in a right triangle.
Diameter The distance across a circle through its center.
Radius The length of a line segment between the center and circumference of a circle or sphere

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