1.2 Calculate perimeter and area of parallelograms & trapeziums

• Mathematics
• Lower Secondary (Key Stage 3)

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Calculate perimeter and area of parallelograms & trapeziums

How do we find the perimeter of a shape?

Perimeter

The perimeter of a shape is determined by adding the length of all the sides and edges enclosing the shape.

How do we find the area of a shape?

Area

Area is calculated by multiplying the length of a shape by its width.

What is a parallelogram?

A parallelogram

A parallelogram is a special type of quadrilateral that has both pairs of opposite sides parallel and equal.

What is a trapezium?

Trapezium

A flat shape with 4 straight sides with exactly one pair of opposite sides parallel to each other. The parallel sides of a trapezium are called bases and the non-parallel sides of a trapezium are called legs.

Calculate perimeter and area of parallelograms & trapeziums

Perimeter of a parallelogram

Area of a parallelogram

Activity

Practice problem

https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/geometry-parallelogram-area/a/area-of-parallelogram

Area

https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/geometry-parallelogram-area/e/area_of_parallelograms

Missing side

https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/geometry-parallelogram-area/e/find-missing-side-when-given-area-of-a-parallelogram

Area of a trapezium/trapezoid

Activity

https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/geometry-area-trap-composite/e/areas_of_trapezoids_rhombi_and_kites

Miro Board

https://miro.com/welcomeonboard/NktjOFVEMTAwV3d0MGRNM1BYSEkwQnJ3NHVHZGlQSEN0VktreXd2cFp5UTZ5RHA1U1dzYXdqWmF5M2hQeThjaHwzNDU4NzY0NTUzNjIyODU4ODU4fDI=?share_link_id=651780135477

What is a parallelogram?

What is a trapezium?

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