Perimeter, Area and Missing Side

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 PERIMETER.

P= (2xL) + (2XW)

ENTER THE NUMBER ONLY.

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

Last Step: Find the AREA.

Fill in the Blanks

Find the PERIMETER of the RECTANGLE.

Fill in the Blanks

Find the AREA of the RECTANGLE.

ENTER THE NUMBER ONLY! DO NOT FORGET YOUR DECIMAL.

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

Find the area of the red rectangle.

Enter the number ONLY. (No Units)

Fill in the Blanks

Find the area of the yellow square.

Enter the number ONLY. (No Units)

Fill in the Blanks

What is the TOTAL AREA of the composite shape?

HINT: Add the two areas.

Enter the number ONLY. (No Units)