A rectangle measures 18cm by 12cm.(a) If each dimension is reduced by 2cm, by what percentage is:
i). The perimeter reduced,(express your answer to four significant figures). (3mks)
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Step-by-step explanation:
18cm by 12cm
perimeter = 2(18+12)
= 2(30)
= 60 cm
if each dimension is reduced by 2cm
perimeter= 2(16+10)
= 2(26)
=52cm
percentage= 52/60*100
260/3
8.666% is reduced
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