# Coverings And Surroundings

## Unit 4 Description

We learned what are the formulas for perimeter, area of squares and rectangles, area of a rectangle, surface area of a pyramid, Surface area of rectangular prism and volume of rectangular prisms. Also The units for perimeter area surface and volume. Definitions of area perimeter area surface area and volume.

## What is perimeter?

Perimeter is the outside of a shape. Perimeter is measured in units (cm).

## What is area?

Area is the inside of a shape. Area is measured in square units.

Area of a triangle = lxw divided by 2

Area of a square and rectangle = lxw

Area of a parallelogram = base x height

## What is surface area?

The surface area is the amount of surface inside a 3d shape. Surface area is measured in square units.

• Surface Area of Pyramid = (lxw) +4 (bxh divided by 2)

• Surface area of a rectangular prism = 2(LxW) + 2(LxW) + 2(LxW)

## What is volume?

• The amount of space that an object takes up

• Volume of Rectangular Prism = L x W x H

• Volume is measured in cubic units