Circle

(the database of solved problems)

All the problems and solutions shown below were generated using the Circle Calculator.

Select category

ID	Problem	Count
1	Find the area $ A $ of a circle if radius $r = \frac{ 25 }{ 2 }$.	130
2	Find the area $ A $ of a circle if ???.	92
3	Find the circumference $ C $ of a circle if diameter $d = \frac{ 15 }{ 2 }$.	83
4	Find the area $ A $ of a circle if area $A = \frac{ 5447 }{ 50 }$.	59
5	Find the radius $ r $ of a circle if diameter $d = \frac{ 41 }{ 5 }$.	58
6	Find the diameter $ d $ of a circle if area $A = \frac{ 2011 }{ 10 }$.	57
7	Find the area $ A $ of a circle if diameter $d = 36$.	57
8	Find the area $ A $ of a circle if diameter $d = 56$.	57
9	Find the diameter $ d $ of a circle if diameter $d = 26$.	54
10	Find the area $ A $ of a circle if circumference $C = 5$.	53
11	Find the radius $ r $ of a circle if diameter $d = 26$.	50
12	Find the area $ A $ of a circle if circumference $C = 6\pi$, radius $r = \frac{ 11 }{ 2 }$ and diameter $d = 60$.	42
13	Find the area $ A $ of a circle if radius $r = 65$.	34
14	Find the area $ A $ of a circle if radius $r = \frac{ 132 }{ 5 }$.	27
15	Find the area $ A $ of a circle if radius $r = 20$.	27
16	Find the area $ A $ of a circle if diameter $d = 15$.	26
17	Find the radius $ r $ of a circle if area $A = \frac{ 5447 }{ 50 }$.	21
18	Find the area $ A $ of a circle if ???.	19
19	Find the area $ A $ of a circle if radius $r = 535$.	18
20	Find the area $ A $ of a circle if circumference $C = 5$.	16
21	Find the circumference $ C $ of a circle if diameter $d = 15$.	13
22	Find the diameter $ d $ of a circle if diameter $d = 26$.	12
23	Find the area $ A $ of a circle if radius $r = 31\, \text{mm}$.	11
24	Find the area $ A $ of a circle if ???.	10
25	Find the radius $ r $ of a circle if diameter $d = \frac{ 15 }{ 2 }$.	10
26	Find the area $ A $ of a circle if radius $r = 8$.	9
27	Find the area $ A $ of a circle if ???.	8
28	Find the circumference $ C $ of a circle if area $A = 2826\, \text{cm}^2$, circumference $C = 188.4\, \text{cm}$, radius $r = 30\, \text{cm}$ and diameter $d = 60\, \text{cm}$.	7
29	Find the area $ A $ of a circle if area $A = 4$, circumference $C = 90$, radius $r = 67$ and diameter $d = 12$.	7
30	Find the area $ A $ of a circle if area $A = 10$.	7
31	Find the area $ A $ of a circle if radius $r = 5\, \text{mm}$.	7
32	Find the area $ A $ of a circle if radius $r = 40$.	6
33	Find the area $ A $ of a circle if radius $r = 2$.	6
34	Find the area $ A $ of a circle if radius $r = 10$.	6
35	Find the area $ A $ of a circle if area $A = 153.938\, \text{mm}^2$.	6
36	Find the area $ A $ of a circle if area $A = 5361\, \text{mi}^2$.	6
37	Find the area $ A $ of a circle if circumference $C = 80\, \text{mm}$.	5
38	Find the area $ A $ of a circle if radius $r = 3.8\, \text{mm}$.	5
39	Find the area $ A $ of a circle if radius $r = 10.4\, \text{cm}$.	5
40	Find the area $ A $ of a circle if radius $r = 5$.	5
41	Find the area $ A $ of a circle if radius $r = 9\, \text{in}$.	5
42	Find the radius $ r $ of a circle if circumference $C = 9$, radius $r = 4$ and diameter $d = 8$.	5
43	Find the area $ A $ of a circle if area $A = 65$.	5
44	Find the area $ A $ of a circle if diameter $d = 25.2\, \text{mm}$.	5
45	Find the area $ A $ of a circle if radius $r = 5.4\, \text{cm}$.	5
46	Find the area $ A $ of a circle if area $A = 16\, \text{mm}^2$.	5
47	Find the area $ A $ of a circle if radius $r = 3.8\, \text{cm}$.	5
48	Find the area $ A $ of a circle if circumference $C = 313$.	5
49	Find the area $ A $ of a circle if radius $r = 13.4\, \text{cm}$.	5
50	Find the area $ A $ of a circle if radius $r = 12.5\, \text{mm}$.	4