# Diameter to area

Find the area of a circle whose diameter is 26cm.

Result

A =  530.929 cm2

#### Solution:

$D = 26 \ \\ r = D/2 = 26/2 = 13 \ \\ A = \pi \cdot \ r^2 = 3.1416 \cdot \ 13^2 \doteq 530.9292 = 530.929 \ cm^2$ 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. Pipe cross section The pipe has an outside diameter 1100 mm and the pipe wall is 100 mm thick. Calculate the cross section of this pipe.
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. 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?
4. Circle - simple The circumference of a circle is 930 mm. How long in mm is its diameter?
5. Circle simple Circumference of a circle is 6.28. What is the area of the circle?
6. 22/7 circle Calculate approximately area of a circle with radius 20 cm. When calculating π use 22/7.
7. Circle area Calculate the circle area with a radius of 1.2 m.
8. Annulus The radius of the larger circle is 8cm, the radius of smaller is 5cm. Calculate the contents of the annulus.
9. Circle - easy 2 The circle has a radius 6 cm. Calculate:
10. Chauncey Chauncey is building a storage bench for his son’s playroom. The storage bench will fit into the corner and against two walls to form a triangle. Chanuncy wants to buy a triangular shaped cover for the bench. If the storage bench is 2 1/2 ft. Along one w
11. Bathroom 2 A bathroom is 2.4 meters long and 1.8 meters wide. How many square tiles 1 dm on each side are to be used to cover it?
12. One hectare How many square meters are one hectare?
13. Area of a triangle What is the area of a triangle that has the base 4 1/4 and the height of 3 3/3?
14. Hamster cage Ryan keeps his hamster cage on his dresser. The area of the top of Ryan's dresser is 1 2\3 as large as the area of the bottom of his hamster cage. The area of the dresser top is 960 square inches. How many square inches of his dresser top are not covered b
15. Rape The agricultural cooperative harvested 525 ares of rape, of which received 5.6 tons of rape seeds. Calculate the yield per hectare of rape.
16. Bicycle wheel After driving 157 m bicycle wheel rotates 100 times. What is the radius of the wheel in cm?
17. Clock hands The second hand has a length of 1.5 cm. How long does the endpoint of this hand travel in one day?