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Find the area of a sector with a radius of 5cm and an angle of 120 degrees?

pi r r

pi 5x5

25pi = 360 degrees

120/360 x 25pi = 25/3 pi

Teaching Points:

Area of a circle + other formalue for circumfrence

Degrees of a circle

Fracti...

Answered by Anish P. • Maths tutor

4847 Views

How do you measure the gradient of a straight line joining two points?

There is a simple method for working out the gradient of a straight line joining any two points, for which the X and Y coordinates are known. For instance, if our first point is: A(X₁,Y₁

Answered by Alex T. • Maths tutor

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What is 17% of 84?

We know that 17% is the same as 17/100 or 0.17 so we do 0.17*84 = 14.28.

Answered by Chris B. • Maths tutor

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How do you solve quadratic equations?

A typical GCSE question will give you an equation in the from ax² + bx + c, x² - 8x + 15 = 0 for example, and ask you to solve the possible value of X. To do this we need to split th...

Answered by Tutor55115 D. • Maths tutor

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How do you solve the following simultaneous equations? Equation 1: 2x + 3y = 13 Equation 2: 3x - y = 3

There are various ways to solve simultaneous equations. The two easiest are by elimiation and by substitution. By Elimation When solving by elimination you want to ensure that you ...

Answered by Luke S. • Maths tutor

8517 Views