Xiaolan made a cylinder with a bottom area of about 3.14cm2 from a cone with a bottom area of 12.56cm2 and a height of 1.5cm______ cm．

Xiaolan made a cylinder with a bottom area of about 3.14cm2 from a cone with a bottom area of 12.56cm2 and a height of 1.5cm______ cm．

13 × 12.56 × 1.5 ﹣ 3.14, = 12.56 × 0.5 ﹣ 3.14, = 6.28 ﹣ 3.14, = 2 (CM); answer: the height of this cylinder is 2cm

Cast a cylindrical steel with a bottom area of 12.56 square centimeters and a height of 60 cm into a cone with a bottom radius of 30 cm. What is the height of the cone

The volume is constant
Cylinder volume = bottom area x height = 12.56x60 = 753.6 cm3
Cylinder volume = cone volume = 1 / 3x bottom area x height, cone bottom area = π R & # 178; = 3.14x30x30 = 2826
Height = cone volume ／ bottom area X3 = 753.6 ／ 2826x3 = 0.8cm

A cylindrical iron block with bottom circumference of 12.56 cm and height of 10 cm is melted and cast into a cone with bottom area of 20 square cm. What is the height of the cone
fast

12.56 / 3.14 = 4cm (diameter)
4 / 2 = 2 cm (radius)
2 * 2 * 3.14 = 12.56 square centimeter (bottom area)
12.56 * 10 = 125.6 cm3 (volume of cylindrical iron block)
Height = 125.6 divided by (20 * 1 / 3) = 18.84 cm (cone height)