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

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
perhaps
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