![]() 2) but the same formula is used for all of them.Ĭalculate the surface area of the triangles no. The surface area or surface (A) of a triangle is calculated by the formula:Ī (triangle) = 0.5 x base x height = 0.5 x b x h. The height (h), base (b), width (w), length (1) and diametre (d) of the most common surface areas ![]() ![]() In the case of a circle the expression diametre (d) is used (see Fig. In the case of a square or a rectangle, the expression length (1) is commonly used instead of base and width (w) instead of height. An example of a right angle is the corner of this page. The height is always perpendicular to the base in other words, the height makes a "right angle" with the base. ![]() The height (h) of a triangle, a rhombus, a parallelogram or a trapezium, is the distance from a top corner to the opposite side called base (b). This Section will discuss the calculation of some of the most common surface areas: the triangle, the square, the rectangle, the rhombus, the parallelogram, the trapezium and the circle (see Fig. It might be necessary to calculate, for example, the surface area of the cross-section of a canal or the surface area of a farm. It is important to be able to measure and calculate surface areas. Surface areas of canal cross-sections and farms
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