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If one side of a rectangle is 2A + B, and the other side is a − 12b larger than it, then the circumference of the rectangle is () A. 10a+3bB. 5a+bC. 7a+bD. 10a-b
∵ one side of the rectangle is 2A + B, and the other side is a − 12b larger than it, ∵ the other side is 2A + B + a-12b = 3A + 12b, ∵ the circumference of the rectangle is 2 (2a + B + 3A + 12b) = 10A + 3B
Line a is equal to 10 cm, B is equal to 8 cm, C is equal to 3 cm to find the circumference of the figure
21
1. How many centimeters is the circumference of this figure after placing the rectangle of 2cm long and 1cm wide in one, two and three layers and finishing the 15th layer?
On the 15th floor, its perimeter is 15 × 2 = 30cm
The circumference of a rectangle 15 × 1 = 15 cm wide
So its circumference is (30 + 15) × 2 = 90cm
[I hope I can help you]
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