The area of a circle is 16π cm squared. Find the diameter of the circle.
We can calculate the area of a circle using the following formula:A = pi x r2The area we are given is 16pi. Therefore, we can divide both sides by pi. So,16pi = pi x r2becomes16 = r2We can squareroot both sides to calculate the value of r. sqrt16 = sqrt r2Therefore r = 4We can then use the formula d = 2r to calculate the diameter. Therefore the diameter of the circle is 2x4 = 8cm.
MP
Related Maths 13 Plus answers
All answers ▸If area of cube is 96, what is its volume?
Given a=2, b=-5, c=0.5, d=-20 ... find abc, and 2d+10c
An amount of money is split between three people: A, B, and C. C gets 50%, B get 3/9, a) what share does A get. A has £10 b) how much does B have? C spends 90% of his money c) how much total money is left between A, B and C?
E = {Students in Year 12} G = {Students who study German} F = {Students who study French} M = {Students who study Maths} (i) G ∩ M = Ø Use this information to write a statement about the students who study German in Year 12