When wrapping a birthday gift in the shape of a rectangular prism for
his mother, Kenji adds an additional 2.5 square feet of gift wrap to allow for overlap.How many square feet of gift wrap will Kenji use to wrap a gift 3.5 feet long, 18 inches
wide, and 2 feet high?
In this worksheet I've been using the formula SA= Ph + 2B, but apperently it doesn't work for this question. I saw a similar post and it was compeletely different. They did:
2(3.5 * 1.5) = 10.5
2(1.5 * 2) = 6
2(2 * 3.5) = 14
+2.5 = 33 square feet
But I am wondering where they're getting the 1.5 from and what these formulas are. Please help.
18" = 1.5 ft
So, the area of the box is
2(3.5*1.5 + 3.5*2 + 1.5*2) = 30.5 ft^2
Or, using the Ph+2B, we have
2(3.5+1.5)*2 + 2(3.5*1.5) = 30.5
ft^2
Now add the 2.5 to get 33 ft^2
The first formula uses the fact that you have two sets of rectangular faces. The area of each face is its length*width
The second formula (Ph+2B) uses the idea of unwinding the sides of the box. Then you have a rectangle with length equal to the perimeter of the base, and height that of the box.
The 2B is just the area of the top and bottom.
Stop cyber bulling
They get the 1.5 from the 18 inches. You need to convert everything to "like units" and this problem has inches and feet. So they converted 18 inches into 1.5 feet.
nope
why so mean and also to be honest we all need friends soo no one can really say anything.
you are not wrong but i do have friends
i need friends mine called me fake
HE IS FROM JUNE 2 2020
(relizes that it is 2021 now)
I am really not smart
🤣