Two 2D shapes

Decide which shapes have more area:
  (a) a square of 8cm side; or
  (b) two rectangles with sides 5cm and 15cm?

Write result as 1 or 2 (rectangles)

Correct result:

x =  2

Solution:

a=8 cm S1=a2=82=64 cm2  b=5 cm c=15 cm  S2=2⋅ b⋅ c=2⋅ 5⋅ 15=150 cm2  S2>S1  x=2

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