A rectangle is 8 cm long and 4 cm wide. What is its perimeter? What is its area? What is the side length of a square whose perimeter is equal to it? What is its area? The sum of the upper and lower bottoms of a trapezoid is 12 decimeters, and its area is? A parallelogram with a base length of 7.5 decimeters. Its area is equal to that of the trapezoid, and its height is?

A rectangle is 8 cm long and 4 cm wide. What is its perimeter? What is its area? What is the side length of a square whose perimeter is equal to it? What is its area? The sum of the upper and lower bottoms of a trapezoid is 12 decimeters, and its area is? A parallelogram with a base length of 7.5 decimeters. Its area is equal to that of the trapezoid, and its height is?

Perimeter (8 + 4) * 2 = 24cm
Area 8 * 4 = 32 square centimeters
The length of the side of a square equal to its length
24 / 4 = 6cm
Area 6 * 6 = 36 square centimeter
Trapezoid area 12 * 5 / 2 = 30 square decimeters
Height 30 / 7.5 = 4 decimeters

The circumference of the bottom surface of the rectangle is 20 cm and the height is 8 cm. Its side area is ()

160, the side of the cuboid is expanded to be a rectangle, the perimeter of the bottom is the length of the expanded rectangle, and the height is the length of the expanded rectangle, 20 * 8 = 160