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The formula for finding the circumference of a circle is Equation: C = 2(pi)r . What can we do if we know the circumference but want to know the radius?

Rearange the equation to make r the subject of the formula. So we divide both sides by 2(pi)
AM
Answered by Amy M. • Maths tutor
7088 Views

A circular ice rink has a diameter of 60 meters. Calculate the area of the ice rink in terms of π in meters

Area of a cirlce = π x r^2 The radius (r) = the diameter / 2 So, r = 60/2 = 30 Therefore, the area of the ice rink = π x 30^2 = 900π
SK
Answered by Sophie K. • Maths tutor
6009 Views

What are surds and why are they used?

Surds are irrational numbers that can't be represented accurately as a fraction or reccuring decimal, so they are left as a square root. For example: √ 3 . Calculate the square root of 3 using your calculato...
AO
Answered by Aisling O. • Maths tutor
37715 Views

Why does exp(x+y) NOT equal exp(x)+exp(y)? [A-level Maths and Further Maths common mistake]

This is a very common mistake, so don't worry. To see why this is the case, let's go back through our notes to the "laws of indices" and recall the rule for adding powers; a m * a n = a (m+n) The e...
TD
Answered by Tutor56252 D. • Maths tutor
10065 Views

Solve 6x^2 > 3 - 7x

First put everything to one side, 6x 2 + 7x - 3 > 0 Then factorise the LHS, (3x - 1)(2x + 3) > 0 Get two answers for x, x = 1/3 or x = -3/2 Then work out where the values of x will make the equation ab...
WJ
Answered by William J. • Maths tutor
4047 Views