Radius, Diameter, "Pi", and Circumference

About circles, select the right options only.

• The radius is the double of the diameter

• If the diameter is 13 cm, the radius is 6.5 cm.

• Circumference means the distance around a circle.

• Diameter divided by Circumference = "Number pi "

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CCSS.HSG.C.B.5

CCSS.HSG.GMD.A.1

The diameter of a truck's tire is 83.8 cm. Its radius is:

• 40.9 cm

• 42.6 cm

• 41,9 cm

• 41.6 cm

Loot at the picture. Select the correct answers only.

• CD = CB

• CD is a diameter

• BC = 2 x AC

• AC = AB = AD

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CCSS.HSG.C.A.2

CCSS.HSG.C.A.3

To estimate a calculation using 

number  $\pi$  , this needs to be:

•  $\pi$  = 3

•  $\pi$  = 3.1

•  $\pi$  = 3.14

•  $\pi$  = 3.2

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CCSS.7.G.B.4

Using  $C\ =\ 2\ \pi\ r$ ,  calculate the circumference of the circle shown on the picture.

• C = 18.574 cm

• C = 17.584 cm

• C = 15.784 cm

• C = 17.548 cm

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CCSS.HSG.GMD.A.1

Find the diameter of the circle above.

• D = 500 cm

• D = 600 cm

• D = 250 cm

• D = 300 cm

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CCSS.HSG.GMD.A.1

The image shows 4 equal coins in a row. The radius of one of these coins is 6.25 cm as shown. Calculate the distance, in mm, from the point R to the point S.

• 480

• 52

• 500

• 5400

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CCSS.HSG.GMD.A.1

Look at the picture. We have 4 equal circles inside the rectangle MNOP. Each circle has diameter equals 7 m. The area of the rectangle is about:

• 270 m²

• 300 m²

• 330 m²

• 350 m²

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CCSS.7.G.B.6

The circle above shows a diameter AZ. W is the circle's center. If WZ = 5.5 m, estimate its circumference. We will get:

• 31 m

• 33 m

• 35 m

• 37 m

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CCSS.HSG.C.B.5

CCSS.HSG.GMD.A.1

The picture shows 3 equal circles touching each other.

QV = 7.3 cm. Calculate the perimeter of the triangle QUS.

It measurement, in cm, will be:

• 43.3

• 44.1

• 43.5

• 43.8

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CCSS.HSG.SRT.B.5

CCSS.HSG.SRT.C.8