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3 March, 17:21

The perimeter of Rectangle A is two times that of Rectangle B. Rectangle B is

8 cm long and 9 cm wide. Given that Rectangle A and Rectangle B are similar,

what is the perimeter of Rectangle A?

A. 68 cm

B. 34 cm

C. 144 cm

D. 72 cm

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Answers (2)
  1. 3 March, 17:44
    0
    A) 68 cm

    Rectangles have 4 sides so you would take 8 (2) and 9 (2) and get 16 + 18 = 34 for rectangle B. Because rectangle A is twice the size of rectangle B, you would just take 34 and double it to get 68.
  2. 3 March, 17:44
    0
    A. 68 cm

    Explanation

    Rectangles have 2 pairs of parallel sides, so you should multiply both sides by two.

    (8•2) + (9•2) = 34

    Since rectangle a perimeter is two times that of rectangle b perimeter, then you should find the perimeter of rectangle b and multiply it by two.

    34•2=68

    So the perimeter of rectangle a is 68cm.
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