Division
Diameter/Radius
Area of a Circle
Circumference
Scale
100
120/6
20
100
The diameter is 66cm, so what is the radius?
33cm
100
The formula for area of a circle

A= Pi x r x r

or

A= Pi x r2

100
The formula for circumference of a circle is....
C=Pi x Diameter

or

C=Pi x Radius x 2

100
If the scale is 1:4, which number means the size in real life?
the 4
200
453/5
90.6
200
The diameter is 75cm, so what is the radius?
32.4cm
200
The radius is 5, so the area is...

78.5cm2

200
The diameter is 10cm, so the circumference is...
31.4cm
200
A drawing of a puppy is 10cm long. The scale is 1:5. How long is the puppy in real life?
50cm
300
130.5 / 5
26.1
300
The circumference is 172.2cm, so the diameter is...
55cm
300
The diameter is 55, so the area is...

2374.625cm2

300
The radius is 14cm, so the circumference is...
87.92cm
300
Lets pretend Mr. Graham is 110cm tall. If the scale of Mr. Graham's statue is 50:1, how tall is the statue?
5500cm because the statue is 50x bigger than Mr. Graham
400
808.8 / 3
269.6
400
The circumference is 282.6cm, so the radius is...
45cm
400
The diameter is 2, so the area is...

3.14cm2

400
The radius is 0.5cm, so the circumference is...
3.14cm
400
A picture of a cat is 6cm, but in real life the cat is 66cm. What would the scale be?
1:11 because it is 11 times bigger in real life
500
750.7 / 6
125.11666666666666666666
500
The circumference is 550cm, so the diameter is...
175.1592357cm
500
The radius of one circle is 6 and the diameter of another circle is 10. What is the area of both circles all together?

78.5cm2 + 113.04cm2 = 191.54cm2

500

The radius of one circle is 5cm and the diameter of another circle is 5cm. What is the circumference of both circles all together?

47.1cm
500
On a big map, Eskilstuna is 127.94cm from Mr. White's home. If the scale is 1 : 5,000,000, how far is Mr. White from home?

639,700,000cm or 6397km

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