The edge length of a cube is 3cm. The surface area of the cube is () square cm, and the volume is () cm3

The edge length of a cube is 3cm. The surface area of the cube is () square cm, and the volume is () cm3

The surface area is (3 * 3 * 6 * 2-3 * 3 * 2 = 90) square cm,
The volume is (3 * 3 * 3 * 2 = 54) cm3

The surface area of a cube is 24 square decimeters. Divide it into two identical cuboids. The surface area of each cuboid is______ Square decimeter

The area of a surface of a cube is: 24 △ 6 = 4 (square decimeter), so the surface area of each cuboid is: 24 △ 2 + 4 = 16 (square decimeter), so the answer is: 16

For a square with a side length of 25 meters, its side length increases by 20%, and how many square meters does its area increase?

（1+20%）×（1+20%）-1=44%
25 × 25 × 44% = 275 square meters (increased area)

If C is used to represent the area of a circle, the formula for calculating the circumference of the circle is () or (). 2,
2. When drawing a circle with a compass, the distance between the two feet of the compass is 2.5cm. What is the circumference of the circle?

Perimeter = pi * diameter; or perimeter = 2 * pi * radius
PI=3.1415926..
So,
Perimeter = 2 * 3.14 * 2.5 = 15.7

The distance between the two feet of a compass is 5cm. If you draw a circle, what is the circumference of the circle______ What is the area of this circle______ ．

The circumference is: 3.14 × 5 × 2 = 31.4 (CM), the area is: 3.14 × 5 × 5 = 78.5 (square cm). A: the circumference of this circle is 31.4 cm, which is 78.5 square cm. So the answer is: 31.4 cm; 78.5 square cm

1: If the distance between the two feet of a compass is 3cm, what is the circumference of the circle drawn? 2: if the circumference of another circle is 3.14cm, what is its diameter? What is its radius? 3: if C is 6.28cm, what is R and D? 4: the minute hand of a wall clock is 20cm in length. After half an hour, the minute hand of a wall clock is 20cm, How many decimeters does the tip of this minute hand travel? Please answer one question at a time
The third question is if it's not provocative

1: If the open distance between the two feet of the compass is 3cm, what is the circumference of the circle drawn? The diameter is 3 * 2 = 6cm, the circumference is 3.14 * 6 = 18.84cm2, and the circumference of another circle is 3.14cm. What is its diameter? What is its radius? Diameter: 3.14g3.14 = 1cm, radius: 1 / 2 = 0.5cm

The distance between the two feet of the compass is 5cm, and the circumference of the circle is drawn______ Cm, area______ Square centimeter

Perimeter: 3.14 × 5 × 2 = 31.4 (CM), area: 3.14 × 52 = 78.5 (square cm); answer: the perimeter of the circle is 31.4 cm, area is 78.5 square cm

The distance between the two feet of the compass is 4cm, and the circumference of the circle drawn with it is______ The area is______ ．

Perimeter: 3.14 × 4 × 2 = 25.12 (CM) area: 3.14 × 42 = 50.24 (square cm) answer: the perimeter of the circle is 25.12 cm, the area is 50.24 square cm. So the answer is: 25.12 cm, 50.24 square cm

The distance between the two feet of the compass is 4cm, and the circumference of the circle drawn is 5cm______ Cm, the area is______ Square centimeter

Perimeter: 3.14 × 4 × 2 = 25.12 (CM), area: 3.14 × 42 = 50.24 (square cm); answer: the perimeter of the circle is 25.12 cm, area is 50.24 square cm

When the distance between the feet of a compass is 4cm, what is the circumference of the circle___ Cm

∵ the distance between the two feet of a compass is 4cm, the diameter of the circle drawn by it is 2 × 4 = 8cm, and the circumference of the circle is 8 π = 8 π