# 22/7 circle

Calculate approximately area of a circle with radius 20 cm. When calculating π use 22/7.

Result

S =  1257.14 cm2

#### Solution:

$S=22/7 \cdot \ 20^{ 2 }=1257.14 \ \text{cm}^2$

Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!

Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Be the first to comment!

## Next similar math problems:

1. Circle area
Calculate the circle area with a radius of 1.2 m.
2. Cable
Cable consists of 8 strands, each strand consists of 12 wires with diameter d = 0.5 mm. Calculate the cross-section of the cable.
3. Perimeter to area
Calculate the area of a circle with the perimeter 15 meters.
4. Circle - easy 2
The circle has a radius 6 cm. Calculate:
5. Annulus
The radius of the larger circle is 8cm, the radius of smaller is 5cm. Calculate the contents of the annulus.
6. Sidewalk
The city park is a circular bed of flowers with a diameter of 8 meters, around it the whole length is 1 meter wide sidewalk . What is the sidewalk area?
7. Diameter to area
Find the area of a circle whose diameter is 26cm.
8. Two circles
Two circles with a radius 4 cm and 3 cm have a center distance 0.5cm. How many common points have these circles?
9. Bicycle wheel
After driving 157 m bicycle wheel rotates 100 times. What is the radius of the wheel in cm?
10. Coal mine
The towing wheel has a diameter of 1.7 meters. How many meters does the elevator cage lower when the wheel turns 32 times?
11. Circle - simple
The circumference of a circle is 930 mm. How long in mm is its diameter?
12. Clock hands
The second hand has a length of 1.5 cm. How long does the endpoint of this hand travel in one day?
13. Circles
For the circle c1(S1; r1=146 cm) and c2(S2; r2 = 144 cm) is distance of centers |S1S2| = 295 cm. Determine the distance between the circles.
14. Find x
Solve: if 2(x-1)=14, then x= (solve an equation with one unknown)
15. The diagram
The diagram is a cone of radius 8cm and height 10cm. The diameter of the base is. ..
16. Passenger boat
Two-fifths of the passengers in the passenger boat were boys. 1/3 of them were girls and the rest were adult. If there were 60 passengers in the boat, how many more boys than adult were there?
17. Rounding
The following numbers round to the thousandth: