# Annulus

Calculate the area of two circles annulus k1 (S, 3 cm) and k2 (S, 5 cm).

Result

S =  50.27 m2

#### Solution:

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

Be the first to comment!

## Next similar examples:

1. Annulus
Two concentric circles form an annulus of width 10 cm. The radius of the smaller circle is 20 cm. Calculate the content area of annulus.
2. Annulus
The radius of the larger circle is 8cm, the radius of smaller is 5cm. Calculate the contents of the annulus.
3. Star
Calculate the content of the shaded part of square with side 28 cm.
4. 22/7 circle
Calculate approximately area of a circle with radius 20 cm. When calculating π use 22/7.
5. 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.
6. Circle - simple
Calculate the area of a circle in dm2, if its circumference is 31.4 cm.
7. 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.
8. Circle - easy 2
The circle has a radius 6 cm. Calculate:
9. 6-gon
Perimeter of regular hexagon is 113. Calculate its circumradius (radius of circumscribed circle).
10. 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?
11. CD disc
A compact disc has a diameter of 11.8 cm. What is the surface area of the disc in square centimeters?
12. Diameter to area
Find the area of a circle whose diameter is 26cm.
13. 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?.
14. 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?
15. Well
Rope with a bucket is fixed on the shaft with the wheel. The shaft has a diameter 50 cm. How many meters will drop bucket when the wheels turn 15 times?
16. Complementary angles
Two angles are complementary. If one angle measures 10°, what is the measure of the second angle?
17. The lowest
The lowest temperature on Thursday was 20°C. The lowest temperature on Saturday was 12°C. What was the difference between the lowest temperatures?