TT7 Lessons 87-90 Area and Perimeter

Lesson 87: Perimeter

By Cortney Rose

Perimeter

The total distance around an object or shape is called the perimeter.
You find the perimeter by adding all the sides together. In this example, 7+7+3+3=20

Multiple Choice

The distance around an object is called the 

• area
• perimeter

You can find missing sides

We can set up an equation to solve this problem.

We assume this shape is a rectangle.
We give the missing sides value x.
30= 2x+7+7
30= 2x+14
16=2x
8=x

Multiple Choice

If I wanted to place a fence around my backyard to keep my dog from running away, I would be looking at?

• Perimeter
• Area

Multiple Choice

Ashley wants to use ribbon to put a border around her picture. The picture is 6 inches long and 4 inches wide. How much border will she need?

• 24 inches

• 20 inches

• 10 inches

Fill in the Blank

If the perimeter of the rectangle is 26 units, what is the missing side length?

Multiple Choice

Find the PERIMETER of this figure.

• 20 square feet
• 20 cm
• 25 square feet
• 20 cm sq.

Multiple Choice

What is length of the missing sides?

• 7ft
• 2ft
• 3ft
• 15ft

Lesson 88: Area

Area

Area is how many 1x1 unit squares will fit inside a shape. Different formulas allow us to find the areas of different shapes.

Area of a square or rectangle

Instead of counting up little squares, it is faster to multiply length by width. Other shapes have different formulas.

Multiple Choice

How do you find the area of a rectangle?

• Length + Length + Length + Length
• Length + Width
• Length x Width
• Width x Width

Multiple Choice

Adam was painting a wall in his room. The wall was 4 feet wide and 4 feet tall. What is the area of the wall he has to paint?

• 16ft
• 8ft
• 12ft
• 4ft

Multiple Choice

A lawn had an area of 35 square feet. If it was 7 feet width, how long was it? 

• 84 ft.
• 245 ft.
• 5 ft.
• 14 ft.

Multiple Choice

What is the area of this figure?

• 40 square units
• 45 units
• 13

Lesson 89: Area of a Triangle

Math Response

What is the area of a triangle that has a base measuring 15 feet and a height measuring 6 feet?

Type answer here

Correct Answer: 45

Deg^°

Rad

Math Response

What is the area of a triangle with base 9 feet and height 6 feet?

Type answer here

Correct Answer: 27

Deg^°

Rad

Lesson 90: Area in parts

If you are given a strange shape and asked to find the area, you can do so by finding the area of the shapes that make up the strange shape.

Part it out

This shape consists of two different rectangles. It's up to you how to divide it out, but the easiest way is to have one rectangle measure 10x4 ad the other 3x8.

Then find the area of each rectangle and add them up.

Squares and triangles

This shape consists of a triangle and a rectangle. We can find the total area by finding the area of the triangle (1/2*base*height) and the area of the rectangle (length * width).

Multiple Choice

Find the total area of this shape

• 1200

• 3100

• 2400

• 1800

Multiple Choice

Find the total area of this shape

• 32cm

• 40cm

• 24cm

• 8cm

Homework

Chapter 14: Lessons 87-90

Reminder: Math lab is today from 2-3pm in my zoom room