Perimeter with a Missing Side Lesson

Perimeter, Area and Missing Side

Use your STAAR chart to FIND your formulas!

Multiple Choice

What is the formula for finding the PERIMETER of a SQUARE?

• 4s

• S x S

Multiple Choice

What is the formula for finding the AREA of a SQUARE?

• 4s

• S x S

Multiple Choice

What is the formula for finding the PERIMETER of a RECTANGLE?

• L x W

• (2 x L) + (2 x W)

Multiple Choice

What is the formula for finding the AREA of a RECTANGLE?

• L x W

• (2 x L) + (2 x W)

Find the width of the rectangle.

A = L x W

432 = 36 x ?

Hint: Use the opposite operation.

Multiple Choice

Which operation will you use to find the WIDTH of this rectangle?

• Addition

• Subtraction

• Multiplication

• Division

Multiple Choice

What is the WIDTH of the rectangle?

HINT: 432 DIVIDED BY 36

• 18

• 16

• 13

• 12

Fill in the Blanks

Find the AREA of the RECTANGLE.

STEP 1: FIND THE MISSING SIDE!

HOW?

1. Opposite sides are the same.

2. Subtract your total length from the Perimeter.

3. Divide by 2 (Missing Width Sides)

Multiple Choice

What is the WIDTH of the RECTANGLE?

• 5

• 6

• 50

• 56

Fill in the Blanks

Fill in the Blanks

Fill in the Blanks

Find the area of a COMPOSITE SHAPE.

How?

How do we find the area of a composite shape?

SPLIT or CUT the shape to create TWO parts.

Area of Rectangle: A= L x W

Area of a Square: A= S x S

Remember all sides of a square are the same.

Fill in the Blanks

Fill in the Blanks

Fill in the Blanks