40
25
30 / 2 + 10 - 2 = 23
2, 3 and 5
Divide the circumference by the value of Pi and divide the result by 2 - that will give you your answer.
2.7273
you multiply 3.14 then the radius by the radius then you divide your answer by 2. Example: radius= 30 3.14 times 30 times 30= 30 times 30= 900 times 3.14= 2,826 now you divide it by 2 2,826 divided by 2= 1,413 so then..... the area= 1,413
30/15 is the same as 10/5 which is simply 2.
28
(30 / 2) + 7 = 15 + 7 = 22
40
To divide by a fraction, multiply by its reciprocal, In this instance, 30 / 1/2 = 30 x 2 = 60