Free Printable Happy Pi Day

1.

Mihai measured with the seam meter the diameter d of the base and the length L of the circle from the base of a pan. Calculate the approximate value of the ratio $\frac{L}{d}$ , knowing that L = 79.8 cm, d = 25.4 cm.

a)

3,14...

b)

3,12...

c)

0,31...

d)

3,14

2.

Calculate the approximate area of a disc with a radius of 10 cm.

a)

100 cm²

b)

3,14 cm²

c)

314 cm²

d)

200 cm²

3.

A disk-shaped nozzle has a diameter of 10 m. What is the surface of the disk?( $\pi\approx3,14$ )

a)

$25\ m^2$

b)

$78,5\ m^2$

c)

$31,4\ m^2$

d)

$15,7\ m^2$

4.

Find the length of a circle whose diameter is the side of a square, with a perimeter of 20 cm.

a)

$20\pi$

b)

$10\pi$

c)

$5$

d)

$5\pi$

5.

The circle in the center of a football field has a radius of 9.15 m. Determine the position in front of this circle of a player, which is in front of the center of the field at a distance of 10.1 m.

a)

inside the circle

b)

on the circle

c)

outside the circle

6.

A batch of the shape of a circle has the length equal to $36\pi\ m$ . Determine the radius of the circle.

a)

18 m

b)

36 m

c)

6 m

d)

9 m

7.

Calculate the area of the hatched surface.

a)

$0,75\pi\ cm^2$

b)

$0,25\pi\ cm^2$

c)

$\pi\ cm^2$

d)

$0,5\pi\ cm^2$

8.

Elena planted in her yard a circular flower plot, with a radius of 2.3 m. How many meters does the fence need to surround this plot?

a)

14,444 m

b)

4,6 m

c)

7,22 m

d)

16,61 m

9.

The alarm clock has a length of 9.5 cm. What is the circumference of the circle drawn by the tip of the minute to a complete rotation.

a)

90,25 cm

b)

19 cm

c)

59,66 cm

d)

38 cm

Happy Pi Day

Total questions: 9

Worksheet time: 32mins

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