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If the arc length of the center angle pair of 75 degrees is 2.5x3.14cm, what is the radius of the circle where the arc is located
(360 / 75) * 2.5 * 3.14 is the circumference of the circle,
The circumference / 2 / 3.14 is the radius of the circle
So the radius = (360 / 75) * 2.5 * 3.14 / 2 / 3.14 = 6cm
Given that the radius of the circle is 60 cm, what is the arc length of the circle center angle of 32 ° 30 '? Keep three significant figures! Who answers first and adopts whom!
thirty-four point one
The formula L = RA is used to obtain 34.068827
The radius of a circle is 5 cm. Cut off the arc with the center angle of 30 degrees to find the length of the remaining part of the arc?
30×2π×5/360=5π/6
Given that the length of the generatrix of the cone is 5cm and the height is 3cm, what is the side area of the cone? What is the degree of the center angle of the side expanded view?
According to Pythagorean theorem, the radius of cone is 4cm,
Side area = 2 π * 4 * 5 = 40 π (cm ^ 2)
R is the circumference of the original cone arc
2π*4＝nπ*5 n=288°
If the generatrix of a cone is 5cm long and the radius of its bottom is 3cm long, what is the central angle of its side development?
The side development of a cone is a sector whose arc length is equal to the perimeter of the base of the cone
2*3π=nπ*5/180 n=216
The center angle of its side development is 216 degrees
Knowing the radius of the generatrix and the bottom of a cone, how to find the degree of the center angle? It seems that there is (r bottom / L bus) × 360 = n center angle Is this the case The degree of the center angle of the Y circle refers to the degree of the unfolded view of the side of the cone
Is 360 ° * r / bus length!
If the generatrix of the cone is 5cm, and the radius of the bottom circle is 2cm, what degree is the center angle of the fan in the side development of the cone
2*2π=4π
4 * 360 π / (5 * 2 π) = 144 degrees
The generatrix of the cone is 5cm long and 3cm high. In its side expansion, the center angle of the fan is______ Degree
2π×4=5nπ
180，
The solution is n = 288 °
It's a rectangular box with a length of 19.5cm and a width of 10.5cm. There are 270 in total. What's the total cube? Give me the formula,
19.5 * 10.5 * 10 * 270 = 552825 cm3
It is known that if the area of a sector is 10 cm 2 and the radius of the circle is 5 cm, then the central angle of the circle is radian
Forty
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