Area and circumference of circles

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

Tags

CCSS.HSG.C.A.2

CCSS.HSG.CO.A.1

The diameter of a circle is:

• The measurement around the circle.
• The distance from an edge of a circle to another edge.
• The distance from the center of the circle to an edge of a circle
• The distance from an edge of a circle to another edge through the center. 

Tags

CCSS.HSG.C.A.2

The circumference of a circle is

• The measurement from an edge of a circle to another edge.
• The measurement around the circle
• The measurement from an edge of a circle to another edge going through the center
• The measurement from the center of the circle to an edge of the circle

Tags

CCSS.HSG.GMD.A.1

Which is the formula for the area of a circle?

•  $Area=\pi r^2$  

•  $Area=\frac{radius}{diameter}$  

•  $Area=d^2\alpha$  

•  $Area=E=mc^2$  

Tags

CCSS.7.G.B.4

Which is the formula for the circumference of a circle?

• $C=\pi d^2$

• $C=\frac{\pi d}{2}$

• $C=\pi r^2$

• $C=\pi d$

What is the radius of this circle?

• 12cm

• 6cm

• 24cm

• 3cm

 $Area=\pi r^2.\ Where\ \pi=3.14\ and\ r\ =\ radius$  Using this formula work out the area of the circle shown. 

•  $163.24cm^2$  

•  $15.34cm^2$  

•  $124.28cm^2$  

•   $113.04cm^2$  

 $Area=\pi r^2\ where\ \pi=3.14\ and\ \ r=radius$  

What is the area of this circle?

• 62.59

• 113.1

• 19.81

• 28.26

Tags

CCSS.7.G.B.4

what is the area of this semicircle ?

d = 8 cm

• 100.48 cm²

• 80 cm²

• 200.96 cm²

• 25.12 cm²

 $C=\pi d.Where\ \pi=3.14\ and\ d=\ diameter.$  Find the circumference of this circle.

• 21.98

• 153.86

• 43.96

• 615.44