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If the length of a rectangle is 12cm and the diagonal length is 13cm, the perimeter of the rectangle is______ cm．
According to the length, width and diagonal of a rectangle, it is a right triangle, and the diagonal is a hypotenuse, and the length and width are right angles. Then according to the Pythagorean theorem, the width of the rectangle = diagonal 2-length 2 = 5cm, so the perimeter of the rectangle = (12 + 5) × 2 = 34 (CM)
The circumference of a rectangle is 70cm. It is known that the length of the rectangle is 5cm more than the width. The width of the rectangle is 5cm
What I want is the calculation process
Circumference of rectangle = (length + width) × 2
(70÷2-5）÷2=15
The width is 15
A rectangle is three fifths of a meter in length and one third of a meter in width. What is the circumference of the rectangle?
Six decimeters
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