# Circle

How big is area of circle if its circumference is 80.6 cm?

Result

S =  517 cm2

#### Solution:

$o = 2 \pi r = 80.6 \ \\ S = \pi r^2 \ \\ \ \\ S = \pi \left( \dfrac{ 80.6}{2\pi} \right)^2 = 517 \ \text{cm}^2$

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. Four circles
1) Calculate the circle radius if its area is 400 cm square 2) Calculate the radius of the circle whose circumference is 400 cm. 3) Calculate circle circumference if its area is 400 cm square 4) Calculate the circle's area if perimeter 400 cm.
2. Area to perimeter
Calculate circle circumference if its area is 254.34cm2
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. 22/7 circle
Calculate approximately area of a circle with radius 20 cm. When calculating π use 22/7.
6. Circle area
Calculate the circle area with a radius of 1.2 m.
7. 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.
8. Circle - simple
The circumference of a circle is 930 mm. How long in mm is its diameter?
9. The diameter
The diameter of a circle is 4 feet. What is the circle's circumference?
10. Bicycle wheel
After driving 157 m bicycle wheel rotates 100 times. What is the radius of the wheel in cm?
11. Circle
What is the radius of the circle whose perimeter is 6 cm?
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. 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?
14. Rectangle 45
The perimeter of a rectangle is 60cm. If the length of the rectangle is 20cm. a)find the width b)find the area.
15. Hotel
The hotel has a p floors each floor has i rooms from which the third are single and the others are double. Represents the number of beds in hotel.
16. Expression
Solve for a specified variable: P=a+4b+3c, for a
17. Simplify
Simplify the following problem and express as a decimal: 5.68-[5-(2.69+5.65-3.89) /0.5]