Question

Lea made two candles in the shape of right
rectangular prisms. The first candle is 15 cm
high, 8 cm long, and 8 cm wide. The second
candle is 5 cm higher but has the same length
and width. How much additional wax was
needed to make the taller candle?

A

320 cm3

B

640 cm3

C

960 cm3

D

1280 cm3

Answer 1

5*8*8=320

Answer 2

why?

Answer 3

additional wax is the additional volume r8

Answer 4

ok but i still don't understand why it's 5 times eight?

Answer 5

given the second one is 5 units higer r8

Answer 6

ok. so just one more question, how do you find the volumes of the prisms?

Answer 7

volume of any solid body is area of crossection multiplied with depth

Answer 8

no i mean like, a formula? like Total area is equal to lateral area plus 2 times the base area? how do you find the lateral area?

Answer 9

for a rectangular prism u got to find the area of each face and add em alll......u get the lateral area

Answer 10

uh ok but is there like a specific formula? (ie TA= LA+2B ?)

Answer 11

beh never mind. thanks anyway! :)