For example, to work in cm a 45 mm ... 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 base is 0∙9 ...

Discusses the properties and types of triangles, explaining that a triangle is a closed figure with three sides and angles. It categorizes triangles into equilateral, isosceles, scalene, obtuse, right ...