What is the perimeter?
Perimeter refers to the length of a closed figure. The length integral of the edge around a finite area is called perimeter, which is the length of a closed graph. The perimeter of a polygon is also equal to the sum of all the edges of the graph.
Perimeter calculation formula
Square perimeter formula: C=a×4(a is the length)
Rectangular perimeter formula: C=a×2+b×2(b is the width).
Perimeter formula: C=πd=2πr(d is the diameter, r is the radius, π).
The perimeter formula of a triangle: C=a+b+c(abc is three sides of a triangle).
The formula of sector perimeter: C=2R+nπR÷ 180? (n= central angle) =2R+kR(k= radian)
What do the letters in mathematics stand for? C: Outside line.
L: arc length or straight line
Student: Area
Five: volume
K: slope of straight line
X, y, z: unknown number.
R: the radius of the circle
O: origin in coordinate system
D: Tolerance in arithmetic progression
Q: Common proportions in geometric series.