When the radius is 4 In the circle of π, the arc length corresponding to the center angle of 45 ° is equal to______ .

When the radius is 4 In the circle of π, the arc length corresponding to the center angle of 45 ° is equal to______ .

The arc length corresponding to the center angle of 45 ° is 45 ·π· 4
PI
180=1．
So the answer is 1

S = NX, let's write out the formula of deformation. S = NX, let's say x R / 360 ° then n = what? R = what? Etc

S = n π R 2 / 360 = LR / 2 according to L = n π R / 180
N represents the angle of the center of the circle, that is, the size of the angle opposite to the arc

Is this the sector formula R: l = n: 360?

No, nothing
Fan formula: S = n π R ^ 2 △ 360 = 1 / 2lr
Arc length formula of sector
l=(n/180)*π*r

What is the fan area formula divided by 360?

I'm glad to set the radius r for you. 1. The area of the arc α (or angle n) at the center of the circle is s = α / (2 π) * π r? 2 = α r? 2 s = (n / 360) * π r? 2. Known arc length L: Area s = LR / 2

What is n in the circular motion v = 2 π NR, and what is the difference between the two?

What is n in the circular motion v = 2 π NR, and what is the difference between the two?
Contrast v = ω R
1, v = 2 π NR n is the rotational speed in (R / s)
2, v = 2 π NR / T N is the unit of rotation
N=n/t

(1/60)*360-(1/3600)*360+x/60-x/3600=x Can you translate this formula into Chinese? / what is the symbol, *?

/It's a fractional line, and "divided by" means the same thing

When 0 ＜| R | 3%, a = A0 × (1 + R) ^ n ≈ A0 × (1 + NR), why is the value less than 3%? How to deduce the formula

Suppose a = A0 × (1 + R) ^ n, B = A0 × (1 + NR) a / b = (1 + R) ^ n / (1 + NR), the upper and lower take partial derivatives of R, we get that f '(n) = n (1 + R) ^ (n-1) / N = (1 + R) ^ (n-1) when n tends to infinity, f' (n) tends to 1, so a ≈ B. take 3%, just for the convenience of understanding, in many experimental data, it is basically controlled within 0-5%

Is the cone area formula s = n / 360 × π R × R + π R × R or S = π R × R + π RL? Which one? Or both? Is l in the second formula the generatrix of the cone or the circumference of the base of the cone?

The surface area of the cone is equal to the side area plus the base area
S side = CL / 2 = 2 π RL / 2 = π RL
S base = π r
So, s = π RL + π r
Where l is the length of the generatrix of the cone, C is the perimeter of the bottom of the cone, and R is the radius of the bottom

It is known that the center angle of the sector is 150 ° and the arc length is 20 π cm Give me the process. Thank you

Let the radius be r, 20 pails = 150 pails, R / 180, r = 24, (arc length formula)
S = (1 / 2) LR = (1 / 2) * 20 Pai * 24 = 240 Pai (fan area formula) cm ^ 2

If the arc length of a sector is 20 π cm and the area is 240 π cm?, what is the central angle of the sector

Let the radius be r
1/2*20π*R=240π
R = 24
Center angle n = L / r = 20 π / 24 = 5 π / 6