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Put the rectangle 2 cm in length and 1 cm in width as shown in the figure in one, two, and three layers, and finish the 15th layer. What is the circumference of this figure______ Cm
(2 × 15 + 1 × 15) × 2 = 45 × 2 = 90 (CM) a: the circumference of this figure is 90 cm, so the answer is: 90
Enlarge a circle with a radius of 4cm by 3:1, and the perimeter of the new figure is () and the area is ()
It doesn't matter,
What is the perimeter of the new figure
3.14 * 12 * 2 = 75.32 cm
What is the area
3.14 * 12 * 12 = 452.16 square centimeter
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