Circles and Semi-circles

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Tags

CCSS.HSG.C.A.2

A Circle has a diameter of 10 centimeters.  What is the area of the circle? (Best Choice)

• 5π or about 15.7 cm²
• 10π or about 31.4 cm²
• 25π or about 78.5 cm²
• 100π or about 314 cm² 

Tags

CCSS.7.G.B.4

CCSS.7.G.B.6

What is the diameter of this circle?

• 3.5
• 6.5
• 6
• 7

Tags

CCSS.7.G.B.4

What is the area of this circle?

• 163.2 cm^2

• 15.3 cm^2

• 124.2 cm^2

• 113.0 cm^2

Which segment is the diameter?

• AC
• BD
• LM
• CE

Tags

CCSS.7.G.B.4

Mrs. Wilson placed the welcome mat shown below on her front door step. What is the area of her welcome mat in square feet? Leave in terms of π. (Hint: The shape is HALF a circle.)

• A = 2π
• A = 8π
• A = 10π
• A = 4π

what is this shape called?

• circle

• semi circle

• quarter circle

• triangle

What is the area of this semi circle? 

• 100.5 square cm
• 25.1  square cm
• 50.3 square cm
• 12.6 square cm

Find the area of the semicircle. Round you answer to the nearest hundredth.

• 76.93

• 19.23

• 153.86

• 21.98

Find the area of the semicircle. Round you answer to the nearest hundredth.

• 18.84

• 9.42

• 56.52

• 113.04