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A rectangular piece of land has a circumference of 90m and a width of 5 / 4 of its length. How many square meters is the area? Don't say I'm stupid, I'm not good at this kind of problem~
The perimeter is 90m
Then the sum of length and width is 90 △ 2 = 45 meters
Then the length is 45 × 5 ^ (4 + 5) = 25m
Width 45-25 = 20m
25×20=500
A: the area is 500 square meters
A rectangular piece of glass, 50 cm in circumference, 5 cm longer than width, its area
How to express
Length width = 5, length = width + 5
Perimeter = 2 (length + width) = 2 (width + 5 + width) = 50
2 width + 5 = 25
Width = 10
Length = width + 5 = 10 + 5 = 15
Area of rectangular glass = length * width = 15 * 10 = 150 square centimeter
A rectangular sheet of iron is four fifths of a meter long and one half of a meter wide. What is its circumference?
A rectangular sheet of iron is four fifths of a meter long and one half of a meter wide. What is its circumference?
Perimeter = (4 / 5 + 1 / 2) x 2
= (0.8 +0.5) x 2
= 1.3 x 2
= 2.6 dm
A rectangle is three fourths of a meter long and one half of a meter wide. How many meters is the circumference of the rectangle?
Perimeter L = (3 / 4 + 1 / 2) * 2 = 5 / 2
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