Whats the volume of a cone? Lengths: 9cm, 5cm

A)225cm^3
B)75cm^3
C)25cm^3
D)15cm^3

  B)  75π cm³

Step-by-step explanation:

The volume of a cone is given by the formula ...

  V = (1/3)πr²h

Your cone has r = 5 cm and h = 9 cm. Putting these values into the formula gives ...

  V = (1/3)π(5 cm)²(9 cm) = 75π cm³

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.