A right cone has radius 9cm and slant height 12cm. The radius and slant height are both multiplied by 2/3. Which of the following correctly describes the effect on the surface area?

The surface area is multiplied by 4/9.

The surface area is multiplied by 2/9.

The surface area is multiplied by 4/3.

The surface area is multiplied by 2/3.

The surface area is multiplied by 4/9.

Step-by-step explanation:

Surface Area of a Cone

Being r the radius and l the slant height of a cone, then its surface area is

Now let's think both the radius and the slant height are multiplied by the same factor k, i.e.

r'=kr

l'=kl

The new surface area is

The new surface area is the   times original SA. Since k=2/3, then

The surface area is multiplied by 4/9.

ok

step-by-step explanation:

3x + 4y -25 =0 represents the amount of change sianna should recieve