Question

D=30 см h = 80 см V цилиндр = ?

Answer 1

Ответ:

S=2Пrh

r=d:2=30:2=15cм

П=3,14

S=2×3,14×15×80=7536см²

Answer 2

To calculate the volume of a cylinder, you can use the formula:

V = πr^2h

where V is the volume, π is a mathematical constant approximately equal to 3.14159, r is the radius of the base, and h is the height of the cylinder.

Given that the radius (r) of the cylinder is half the diameter, we can calculate the radius as:

r = D/2 = 30 cm / 2 = 15 cm = 0.15 m

Substituting the values into the formula, we get:

V = π(0.15^2)(80)

Calculating further:

V = 3.14159 * (0.15^2) * 80

V ≈ 0.14137 * 80

V ≈ 11.3096 cubic meters (rounded to four decimal places)

Therefore, the volume of the cylinder is approximately 11.3096 cubic meters.