Question

I need help because i wasnt paying attention in class


10) A gift box in the shape of a rectangular prism has 20 centimeters length, 14 centimeters width and 10 centimeters height. How much the paper will you need to wrap the gift box?​

Answer 1

Answer:

You will need 1400 cm² of paper

Step-by-step explanation:

When you wrap a gift, you wrap around the entire object. We need to find the total surface area of the prism. A rectangular prism has two rectangular faces on the end. The area of one of those faces is Height (of the prism) times Width.

Rectangular prisms also have 4 sides which are composed of rectangles. The area of one of those rectangles is length (of the prism) by the width.

Now we just need to sum up all of those areas.

$A = 2(H*W) + 4(L*W)\\A = 2(10*14) + 4(20*14)\\A = 2(140) + 4(280)\\A = 280 + 1120\\A = 1400$