Circumference 6040

The picture shows a square net in which the side of one square is 1 cm long. Draw a rectangle with an area of 18 squares with a circumference of 22 cm.

Correct answer:

a =  9 cm
b =  2 cm

Step-by-step explanation:

S = ab = 18  cm2 o = 2a+2b = 22  cm b = (222a)/2  a (222 a)/2=18  a (222 a)/2=18 a2+11a18=0 a211a+18=0  p=1;q=11;r=18 D=q24pr=1124118=49 D>0  a1,2=2pq±D=211±49 a1,2=211±7 a1,2=5.5±3.5 a1=9 a2=2  a=a1=9=9 cm

Our quadratic equation calculator calculates it.

b=(222a)/2=(222 9)/2=2 cm

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