Enter Title

Formulas

100

Area of a circle

pi r squared

200

Interior angles of a polygon

(number of sides - 2) x 180

300

Pythagoras Theorem

a² + b² = c²

400

Volume of a prism

Area of cross section x length

500

area of a trapezium 

1/2(a + b)h

Algebra

100

Expand 5x(3x - 4)

15x² - 20x

200

(x + 4)(x - 9)

x² - 5x - 36