A rectangle has length xcm and width x - 1 cm I... - WAEC Mathematics 2010 Question
A rectangle has length xcm and width (x - 1)cm. If the perimeter is 16cm. Find the value of x
A
3\(\frac{1}{2}\)cm
B
4cm
C
4\(\frac{1}{2}\)cm
D
5cm
correct option: c
l = x; b = x - 1
perimeter = 2(l + b) = 16
l + b = (\frac{16}{2}) = 8
l + b = 8
x + x - 1 = 8
2x = 8 + 1
2x = 9
x = (\frac{9}{2})cm
x = 4(\frac{1}{2})
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