Finding the Missing Sides in Area and Perimeter

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

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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

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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.

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