Practise the method.Example 1A rectangle is 8cm long and 4cm wide. Find its perimeter, in cm.RectangleRectangleRectangle. Horizontal side 8 cm; vertical side 4 cm. Diagram not to scale. Use the labelled measurements.8 cm4 cmDiagram not to scaleShow worked answerAnswer: 24The boundary has two sides of each length.8+4+8+4=24cm.Example 2A square has side length 4cm. Find its perimeter, in cm.SquareSquareSquare with all four sides 4 cm. Diagram not to scale. Use the labelled measurements.4 cm4 cmDiagram not to scaleShow worked answerAnswer: 16A square has four equal sides.4×4=16cm.Example 3A rectangle is 7cm long and 6cm wide. Find its area, in cm2.RectangleRectangleRectangle. Horizontal side 7 cm; vertical side 6 cm. Diagram not to scale. Use the labelled measurements.7 cm6 cmDiagram not to scaleShow worked answerAnswer: 42There are 6 rows of 7 square centimetres.7×6=42cm2.