Circumference Is to Circles as Regular Perimeter Area Is to Polygons

A DVD has a diameter of 15 millimeters. Which equation would help you determine the circumference?

What is circumference?

• The distance around a circle.

• The space inside the circle.

• A line from side to side passing through the center.

• A line from the center to the side.

Circumferences are to circles as _____________________________ are to polygons.

• Area

• Volume

• Perimeter

• Surface Area

In a regular polygon, the line from the center to an outer vertex is a(n)

• Apothem

• Central Angle

• Radius

• Regular Polygon

Calculate the perimeter

Find the perimeter of the polygon.

• 77.8

• 73.4

• 78.8

• 67.4

Find the perimeter of the triangle.

• 120 ft.

• 32 ft.

• 40 ft.

• 20 ft.

What is the perimeter of this equilateral triangle?

• 20 meters

• 40 meters

• 60 meters

The polygon circumscribes a circle. What is the perimeter of the polygon?

• 140

• 45

• 70

• 190

perimeter

• 81 km

• 85 km

• 91 km

• 95 km