A circular table has a diameter 140 cm. Calculate the area of the table in cm^2, leaving your answer as a multiple of pi.
The equation for a circle is pi x radius x radius. So,first we need to find the radius which is half the diameter, 140 divided by 2 equals 70 cm. As the question asks for the answer as a multiple of pi there is no need to multiply by pi. So the answer is simple 70 x 70 which without a calculator it would be easier to do 7 x 7 which is 49 and then add the two zeros on at the end, giving 4900. Therefore the answer would be 4900pi cm^2.
FS
Related Maths GCSE answers
All answers ▸Solve the following simultaneous equations. 2x + 5y = -4. 7x + y = 19
Expand and simplify (x − 4)(2x + 3y)^2
How do you go about rearranging equations where the required subject appears on both sides? Such as making x the subject of 7x + a = 3x + b.
A right-angled triangle has one angle size 60 degrees, and hypotenuse of length 32cm. Calculate the length of the side opposite the 60 degree angle, to 3sf.