# CD disc

A compact disc has a diameter of 11.8 cm. What is the surface area of the disc in square centimeters?

Result

S =  109.36 cm2

#### Solution:

$D = 11.8 \ cm \ \\ r = D/2 = 5.9 \ cm \ \\ \ \\ S = \pi r^2 = 109.36 \ cm^2$ 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. 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?
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. 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.
4. Lawns Before a sports hall are two equally large rectangular lawns, each measuring 40 m and 12 m. Maintenance of 10m² lawn cost 45 CZK yearly. On each lawn is circular flowerbed with a diameter 8 meters. How much money is needed each year to take on lawn care?.
5. Mine Wheel in traction tower has a diameter 4 m. How many meters will perform an elevator cabin if wheel rotates in the same direction 89 times?
6. Circle r,D Calculate the diameter and radius of the circle if it has length 52.45 cm.
7. Flowerbed In the park there is a large circular flowerbed with a diameter of 12 m. Jakub circulated him ten times and the smaller Vojtoseven times. How many meters each went by and how many meters did Jakub run more than Vojta?
8. Number What number is 20 % smaller than the number 198?
9. Trapezium 2 Trapezium has an area of 24 square cms. How many different trapeziums can be formed ?
10. Circle - simple Calculate the area of a circle in dm2, if its circumference is 31.4 cm.
11. 22/7 circle Calculate approximately area of a circle with radius 20 cm. When calculating π use 22/7.
12. Circle area Calculate the circle area with a radius of 1.2 m.
13. Annulus The radius of the larger circle is 8cm, the radius of smaller is 5cm. Calculate the contents of the annulus.
14. Circular lawn Around a circular lawn area is 2 m wide sidewalk. The outer edge of the sidewalk is curb whose width is 2 m. Curbstone and the inner side of the sidewalk together form a concentric circles. Calculate the area of the circular lawn and the result round to 1
15. Ace The length of segment AB is 24 cm and the point M and N divided it into thirds. Calculate the circumference and area of this shape.
16. 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?
17. Unknown number Identify unknown number which 1/5 is 40 greater than one tenth of that number.