Annulus

The radius of the larger circle is 8cm, the radius of smaller is 5cm. Calculate the contents of the annulus.

Result

S =  122.522 cm2

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. 22/7 circle Calculate approximately area of a circle with radius 20 cm. When calculating π use 22/7.
2. Circle - easy 2 The circle has a radius 6 cm. Calculate:
3. 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?
4. Bicycle wheel After driving 157 m bicycle wheel rotates 100 times. What is the radius of the wheel in cm?
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. 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. Circle - simple The circumference of a circle is 930 mm. How long in mm is its diameter?
9. Clock hands The second hand has a length of 1.5 cm. How long does the endpoint of this hand travel in one day?
10. Circle simple Circumference of a circle is 6.28. What is the area of the circle?
11. Acreage Plot has a diamond shape, its side is 25.6 m long and the distance of the opposite sides is 22.2 meters. Calculate its acreage.
12. Disjoint How many elements have union and intersection of two disjoint sets when the first have 1 and secodn 8 elements.
13. Street numbers Lada came to aunt. On the way he noticed that the houses on the left side of the street have odd numbers on the right side and even numbers. The street where he lives aunt, there are 5 houses with an even number, which contains at least one digit number 6.
14. Decide The rectangle is divided into seven fields. On each box is to write just one of the numbers 1, 2 and 3. Mirek argue that it can be done so that the sum of the two numbers written next to each other was always different. Zuzana (Susan) instead argue that.
15. Equation 29 Solve next equation: 2 ( 2x + 3 ) = 8 ( 1 - x) -5 ( x -2 )
16. Withdrawal If I withdrew 2/5 of my total savings and spent 7/10 of that amount. What fraction do I have in left in my savings?
17. Norm Three workers planted 3555 seedlings of tomatoes in one dey. First worked at the standard norm, the second planted 120 seedlings more and the third 135 seedlings more than the first worker. How many seedlings were standard norm?