For example, to work in cm a 45 mm measurement ... Substitute the base and height values into the formula. (9 × 12) ÷ 2 = 54 The area of the triangle is 54 mm² Working in centimetres the ...

For example, the formula to work out the area of a triangle. \(\text{Triangle area} = \frac{bh}{2}\) (where \(b\) represents the base of the triangle and \(h\) represents the height of the triangle).