In this worksheet, we will find the areas of triangles, parallelograms and trapezia.
You should already know the formulae for finding the areas of triangles and parallelograms.
Area of parallelogram = base x height
Area of triangle = ½ base x height
Area of trapezium = Average of parallel sides x height
Find the area of this shape?
Area of trapezium = ½ ×(3 + 12) × 10 = 7½ x 10 = 75 sq. units