To find the surface area of the doorstop, we first need to calculate the total surface area of the door.
Given the dimensions of the door:
Length: 16.7 cm
Width: 5 cm
Height: 8.9 cm
Height: 15.9 cm
Surface area of a rectangular prism = 2lw + 2lh + 2wh
Surface area of the door = 2(16.7)(5) + 2(16.7)(8.9) + 2(5)(8.9)
Surface area of the door = 167 + 297 + 89
Surface area of the door = 553 cm²
Now, to calculate how many packages of stickers are needed, we need to divide the total surface area of the door by the surface area covered by one package of stickers:
Number of packages needed = Total surface area of the door / Surface area covered by one package of stickers
Number of packages needed = 553 cm² / 75 cm²
Number of packages needed ≈ 7.37
Since we can only buy whole packages of stickers, we would need to purchase 8 packages of stickers to cover the entire surface area of the door.
You say she answer the question below it wouldn’t doorstop her needs to be covered with stickers to match the door for a directing contest. If one package of stickers covers the surface area of 75 cm² how many packages of stickers need to be purchased find the closest number of the surface area of the doorstop stickers may be purchased in whole packs.
The numbers on the image are 16.7 cm 5 cm 8.9 cm 15.9 cm
1 answer
1 answer