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The circumference of a rectangle is 100 decimeters, of which the width is 10 decimeters less than the length What's the area of this rectangle?
Length + width = 100 / 2 = 50 decimeters
Length: (50 + 10) / 2 = 30 decimeters
Width: (50-10) / 2 = 20 decimeters
Area: 30 * 20 = 600 square decimeters
The circumference of a rectangle is 36 cm and the length is 10 cm. How many cm is the width of the rectangle?
Setting: the width is x cm
2（10+x)=36
Solution 20 + 2x = 36 2x = 16 x = 8
The width of the rectangle is 8 (CM)
A rectangle has a circumference of 36 cm and a length of 10 cm
What's the area of this parallelogram in square centimeters
That is, let 8 be the bottom unchanged, the height change from 10 to 9, and the area is 8 × 9 = 72
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