Rectangle Opposite sides (red sides, blue sides, below) are equal. Opposite sides are parallel All angles are right angles ( 90° ) Perimeter = length + width + length + width = 2(length) + 2(width)
Area = length × width Has two axes of symmetry
Length
Worked example 1 Find the missing dimension of the rectangle shown, given an area of 275 cm2
Solution
Width
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Worked example 2 The rectangle shown has perimeter of 140 cm. The width of the rectangle is 10 cm. Find area of the rectangle.
Solution
Practice questions 23.1
1. Using the rough sketches below, construct the following rectangles and mark in the axis of symmetry in each of the constructions using a dashed line. (i)
A D 7 cm B 4 cm C Z 8.5 cm (ii) W X 45 mm Y Section B Moving forward 371