## Skittles10412 2 years ago 5. Find the volume of the composite space figure to the nearest whole number. (1 point) 416 mm3 705 mm3 1,294 mm3 944 mm3

1. Skittles10412

2. Skittles10412

Find two separate volumes. You have a rectangular prism and a half cylinder.

4. Skittles10412

formulas lol

Well, we just did the cylinder. Do the same as before and take half. For the rectangular prism. V=L*W*H or just multiply all sides

6. Skittles10412

so i would do 6*9*11

7. Skittles10412

witch in that case would be 594

Yes, that's just the volume for the rectangular prism. Now you'll have to find the volume for the half cylinder as well.

9. Skittles10412

okay but no numbers are given for the base or hight of the half cylinder for me to find the volume

They are given. Just look.

what's V for cylinder again?

12. Skittles10412

so base is 9 or 6 and height is 11

13. Skittles10412

for a cylinder V= B*h

height is right, 11 base is wrong

15. Skittles10412

base is not 9 or 6????

16. Skittles10412

for the answer choices there is no pi in any of the answers.

No, remember B is area so in square units so mm^2, not just mm or one dimensional

18. Skittles10412

but witch one would i use to square in order to get the base?? 9 or 6

pi is included inside the answer

neither try to find area of the base NOT a line!!

21. Skittles10412

how would I do that????

you have half a cylinder so find the V like it's a full cylinder then to find the volume, take half of the full cylinder think of the base as a full circle

23. Skittles10412

so i would times everything by 2 to get the full volume or wht

No, for cylinder the base is a circle find area of the circle

A=pi*r^2

to find area, you need?

27. Skittles10412

okay but whats going to be the Radius in order to do that

Yes, you need the radius. Look at the picture.

It shows the diameter.

30. Skittles10412

it would be half of 9 witch is 4.5

right, now find the area then the volume of the half cylinder then add V of half cylinder to V of rectangular prism and that's the answer

32. Skittles10412

which if its 4.5 and you square that it would be 20.25pi

33. Skittles10412

okay so the V of a rectagular prism is 594 and and the v of the half cylinder is 222.75 and i add that up it = to 816.75 witch is just 817 witch is not one of the choices

you miscalculated somewhere on the cylinder

I calculated the right answer. It's one of the choices.

36. Skittles10412

i took 4.5^2 witch is 20.25 and that then becomes 20.25pi then i timed it by 11 and got 222.75

You did NOT account for half of the cylinder. You calculated it like it was a whole one. Take half of it.

38. Skittles10412

so i have to divide the answer 222.75 by 2

Of course, it's not showing a full cylinder.