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Math problems in the third grade of primary school. Waiting online. . .
If the circumference of a rectangle is170m, then

Length+width =170 ÷ 2 = 85m

Then the length is four times the width.

Width = 85 ÷ (4+ 1) = 17m.

Length = 17× 4 = 68m

The area of this rectangle is

68×17 =1156 m2