Given radius 1, arc length 3.2, the center angle α of the arc is equal to? It's best to have a process

Given radius 1, arc length 3.2, the center angle α of the arc is equal to? It's best to have a process

According to L = a * r
So 3.2 = a * 1
We get a = 3.2

The length of the generatrix of a cone is 6 and the height is 35. The radius, side area, surface area of the bottom circle and the width of the side expansion are calculated
There is also a central angle.

Generatrix, height and bottom radius form a right triangle;
r²=L²-h²=36-35=1,r=1；
Side area s = π RL = 6 π;
Surface area s' = s side + s bottom = 6 π + π = 7 π;
Note: the area of the last expanded side view is the side area
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If the base area of a cone is 4 π cm squared and the height of the cone is 2cm, then the center angle of the expanded drawing of the cone
If the radius of the sector is 9cm and the arc length is 3 π cm, the central angle of the sector is 0

According to the title, the radius is 6, the arc length is 4 π, and the center angle is 40 °

If the base radius of a cone is 1 and the height is root 3, then the center angle of the cone is?

√3² ＋1²＝4
The length of conical bus is √ 4 = 2
The circumference of the cone bottom is 2 π × 1 = 2 π
360º×2π÷﹙2π×2﹚＝180º
The angle of the center of the cone is 180-186;