Circles

• 100 cm

• 225 cm

• 9 cm

• 28.26 cm

A line from the center point to the edge of the circle

• diameter

• radio

• radius

• circumference

A line that goes from one edge of the circle to another and crosses the center point

• center

• diameter

• circumference

• radius

What is the formula for area of a circle given the radius?

• A = πr
• A = 2πr
• A = πd
• A = πr²

_{What is the diameter?}

• 5 in

• 10 in

• 3.14 in

• 15.84 in

What is the radius of this circle?

• 18
• 10
• 9
• 8

What is the radius?

• 18
• 72
• 38
• 14

The radius is....

• a line that crosses through the center and touches each edge 
• the center point of a circle 
• a line from the center point to the edge of the circle
• an element in science

what is the area of a circle with the diameter of 16 cm ?

• 66 cm
• 200.96 cm
• 66.5 cm
• 10 m