between SI Learners to do the classwork in pairs and exchange with another units, to solve pair of learners to mark the work. problems and calculate the A trapezium is a quadrilateral with one pair of opposite sides parallel. If perimeter and we tessellate (tile) two trapeziums as shown in the diagram below, we area of: form a parallelogram. (The yellow trapezium is the same size as the blue Polygons one. The base of the parallelogram is equal to the sum of the parallel sides Circles of the trapezium.) We can use the formula for the area of a parallelogram to work out the formula for the area of a trapezium as follows: Area of parallelogram = base × height = (side 1 + side 2) × height Area of trapezium Area of a trapezium ∴ Only one pair of opposite sides is parallel For isosceles trapezium, one pair of opposite sides is equal Example: a) Calculate the area of the following. A = ½ (sum of parallel sides )x height
Learners to do the classwork in pairs and exchange with another pair of learners to mark the work. A trapezium is a quadrilateral with one pair of opposite sides parallel. If we tessellate (tile) two trapeziums as shown in the diagram below, we form a parallelogram. (The yellow trapezium is the same size as the blue one. The base of the parallelogram is equal to the sum of the parallel sides of the trapezium.) We can use the formula for the area of a parallelogram to work out the formula for the area of a trapezium as follows: Area of parallelogram = base × height = (side 1 + side 2) × height Area of trapezium ∴ Area of a trapezium Only one pair of opposite sides is parallel For isosceles trapezium, one pair of opposite sides is equal Example: a) Calculate the area of the following. A = ½ (sum of parallel sides )x height between SI units, to solve problems and calculate the perimeter and area of: Polygons Circles
Gr_9_Term_2_Lesson_PLans_Final.docx