## briana.img one year ago Find the height of the cylinder?

1. briana.img

2. briana.img

need help :( steps?

3. campbell_st

what is the radius of the cylinder..?

4. campbell_st

find the radius of the cylinder is the 1st step to finding the height of the cylinder

5. briana.img

@campbell_st yeah it's 7 soo 461.8= 2(49pi) + hpi ???

6. campbell_st

well the surface area formula is $SA = 2\pi r^2 + 2 \pi r h$ with r = 7 $461.8 = 2\times \pi \times 7^2 + 2 \times \pi \times 7 \times h$ subtracting the area of the circles from both sides $461.8 - 98\pi = 14\pi h$ divide both sides by 14 pi $h = \frac{461.8 - 98\pi}{14\pi}$ now you can calculate the value of h

7. briana.img

@campbell_st got 3.4! thanks for the steps i'll look at this next time i need help on it again!

8. anonymous

Round[ 3.49968, 0.1] = 3.5