Three. But please do it as soon as possible 1. The arc length of a sector is 4 π. Use it to make a side of a cone. Find the bottom radius of the side 2. In a circle O with a radius of 25 cm, the lengths of two parallel strings are 40 cm and 14 cm respectively. What is the distance between the two parallel strings? 3. A circle with a diameter of 24 cm. The maximum side length of an equilateral triangle that can be completely covered shall not exceed cm
The perimeter of the bottom surface is 4 π, and the radius of the bottom surface is 4 π / 2 / π = 2
Radical (25 ^ 2-7 ^ 2) + radical (25 ^ 2-20 ^ 2) = 24 + 15 = 39 cm
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Radical (25 ^ 2-7 ^ 2) - radical (25 ^ 2-20 ^ 2) = 24-15 = 9cm
Radical (12 ^ 2 + 12 ^ 2-2 * 12 * 12 * cos120 degrees) = 12 radical 3cm = 20.78cm