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Rearange the equation to make r the subject of the formula. So we divide both sides by 2(pi)

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

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 calc...

First put everything to one side, 6x² + 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 val...

In order to work out the equation for a line, you need the gradient of the line and the coordinates of a point on the line. To find the gradient on the line, you look at two points on the line and calcula...