Simple equation: the side length of a square is 0.8dm, what are its area and perimeter Simple equation: the side length of a square is 0.8dm, what are its area and perimeter [use letters to indicate the face of the square]

Area is 0.8 * 0.8 = 0.64 square decimeter, perimeter is 0.8 * 4 = 3.2 decimeter

The side length of a square is 3 / 8dm. What is the perimeter and area of the square?

Perimeter, 3 / 8dm times 4 = 3 / 2DM
Area, 3 / 8dm times 3 / 8dm = 9 / 64dm

How many centimeters is the perimeter of a square with an area of 121 square centimeters? 11 times 11 equals 121 11. Where does this figure come from?

Let the side length of a square be a, then a? = 121, because 121 = 11x11 = 11?, so a = 11

If the perimeter of a square is equal to the perimeter of a circle, then their area is smaller

Let R be the radius
Circumference = 2 π R
Square side length = 2 π R △ 4 = π R / 2
Square area = π & # 178; R & # 178 / 4
Area of circle = π R & # 178;
The ratio is: π & # 178; R & # 178; 4: π R & # 178; = π: 4

Given that the area of the sector is 12 π and the radius is 2, the arc length is (). A.8 π b.4 π c.8 π + 6 D.4 π + 6
If the area of the sector is 12 π and the radius is 2, the arc length is ()
A.8π B.4π C.8π＋6 D.4π＋6
The radius should be 3
Given that the area of the sector is 12 π and the radius is 3, the arc length is（
A.8π B.4π C.8π＋6 D.4π＋6

The sector area formula is just like the triangle area formula (s = bottom * height / 2): s sector = arc * radius / 2
So: 12 Wu = L * 3 / 2
L = 8 μ

It is known that the radius of the sector is 6cm and the arc length of the sector is 4 π

Fan angle X, there are 2 * pie * 6 * x / 360 = 4 * pie, x = 120, area = pie * 6 * 6 * 120 / 360 = 12 * pie

If the radius of a sector is increased by four times, the arc length and the area of the sector will be increased by two times

If the radius of a sector is increased by 4 times, the arc length and the area of the sector are increased by 4 times and 16 times respectively

Given that the area of the sector is 15 π square centimeter and the radius is 6cm, the arc length of the sector is calculated

According to the sector area formula, s = 1 / 2 · L · R
L is the arc length and R is the radius
∴15π=1/2·6·l
∴l=5π （㎝）

If AOB = 90 degrees, C is the middle point of arc AB, and the area of shadow a is 16 square centimeters, calculate the area of shadow B
Then draw an arc on the OB line of fan AOB, form a semicircle, connect the OC line, and the figure is saved

Let's see if I did it right. Ao = Bo = A0 = Bo = X
The area of a shadow is 1 / 8 (π X & # 178;) + 1 / 2 {π (1 / 2) x & # 178;} = 1 / 4 π X & # 178; = 16
The area of shadow B = 1 / 8 (π X & # 178;) = 8 square centimeters

If the arc length of the sector is 15.7 meters and the radius is 10 meters, how many square meters is the area of the sector

Hello!
Circumference of circle = 3.14x10x2 = 62.8m
Center angle = 15.7 ÷ 62.8x360 ° = 90 °
Area of circle = 3.14x10 & # 178; = 314m2
Sector area = 314x90 △ 360 = 78.5m2
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Simple equation: the side length of a square is 0.8dm, what are its area and perimeter Simple equation: the side length of a square is 0.8dm, what are its area and perimeter [use letters to indicate the face of the square]