Calculation formula of rectangular duct's right angle bend area, such as 600 * 200 right angle bend area

Calculate the area of two sectors according to the area of quarter circle, and the difference is. 600-200 = 400 is the radius of inner circle, and 600 is the radius of outer circle

What is the formula of length and width multiplied by height

You mean trapezoidal area formula?
Multiply height by 2

Radius formula

Is it the radius formula of a circle?
If so, please see
r=d/2 r=c/2π
If it's anything else, I'm sorry, I don't know

RELATED INFORMATIONS

1. As shown in the picture, there are five runways on the playground of Guangming primary school, with a total length of 200 meters. Each runway is 0.8 meters wide. The diameter of the semicircle at the innermost bend is 30 meters (1) What are the inner radius of the second and fourth curve respectively? (2) If the 200 meter race, standing in the fifth lane of the small army coin, standing in the second lane of the small strong start about how many meters ahead of time?
2. The perimeter of the track and field track is 400 meters. 1. The straight part of the track is selected for the 100 meter race. What is the distance for the athletes to complete the whole race? What is the displacement? 2. In the 800 meter gun race, do athletes from different runways finish the same distance? Please think about it according to the rules of track and field competition
3. The perimeter of the playground is 400m, the length of the two straight roads is 100m respectively, the length of the inner circle curve is 200m, each curve is 1m wide, and there are six runways The perimeter of jinyizhong playground is 400m, the length of two straight roads is 100m respectively, the total length of inner circle curve is 200m, the width of each curve is 1m, and there are six runways (1) how many meters is the difference between the inner ring length and the outer ring length? (2) how many meters is the difference between each runway? What rules do you find?
4. The perimeter of the track and field track is 400 meters. The straight part of the track is selected for the 100 meter race. The distance for the athletes to complete the whole race is 400 meters______ And the displacement is______ In the 800 meter race, athletes from different runways complete the whole distance______ (fill in the same or different), displacement______ (fill in the same or different)
5. The length or width of the field and equipment on the track and field field is 1.22 meters, except for the width of the track and field, the hurdle frame (springboard)
6. Calculation formula of arc length Just answer the formula
7. If the curve of the standard 400m runway is semicircle, and the radius of the innermost curve is 36m, and each runway is 1.2 wide, there are six runways 1. What is the radius of the semicircle runway on the outer circle? 2. How many meters ahead of the starting point of the first runner in the 200 meter race? 3. How many meters ahead of the starting point of the third runner in the 400 meter race? 4. If the 400 meter race is still in progress, how many meters ahead of the first runner is the fifth runner?
8. As shown in the picture, there is a 300 meter small track in the 400 meter track of the school playground. The distance between the large track and the small track is 200 meters. A runs counter clockwise along the large track at the speed of 6 meters per second, and B runs clockwise along the small track at the speed of 4 meters per second. The two start from the intersection a of the two runways at the same time. When they meet on the runway for the second time, how many meters did a run?
9. How to draw a 400 meter long runway on a 200 meter long and 100 meter wide playground? Draw a nine line diagram
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