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How do you calculate the area of a circle?

The equation is 2πr. That is 2 x pi x the radius (not the diameter!)

Answered by Nick O. • Maths tutor

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The straight line joining the points (1, -2a),(a, 1) has a gradient of 5, find the value of a

Solve this simultaneous equations, clearly showing all of your workings: x^2 + 2y =9, y - x = 3

What is completing the square?

Solve to find x: 32x + 43 = -8x - 17

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