**1.5: Using Formulas in Geometry**

Definitions

Perimeter- the sum of the side lengths of a figure

Definitions

Perimeter

**Area**- the number of nonoverlapping square units of a given size that exactly cover the figure

**Base**- can be any side of a triangle

**Height**- the segment from a vertex that forms a right angle with a line containing the base

**Diameter**- segment that passes through the center of the circle and whose endpoints are on the circle

**Radius**- segment whose endpoints are the center of the circle and a point on the circle

**Circumference**- the distance around a circle

**Pi**- ration of a circles circumference to its diameter

**Formulas**:

The equation to find the circumference of a circle:

**2(pi)r**

Equation for the area of a circle:

**(pi)r²**

Area of a triangle:

**(1/2)bh**

Examples

Examples