STAAR Blitz Day 4-Area and Perimeter

STAAR Blitz Day 4
Area and Perimeter

To find the perimeter, add the length of ALL sides.

6 + 6 + 6 + 6 = 24

The perimeter of this shape is 24.

24 what? 24 feet

If you walked all the way around this shape you would walk 24 feet.

Why care?

If you were building a fence around the outside of your yard, you would need to know the Perimeter

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Area

Area is the measure of the inside surface of a shape

To find the area of a rectangle, multiply the length by the width.

Find the Area

The Length (The bottom) is 8

The Width (The side) is 5

Area = Length x Width

8 x 5 = 40

40 what? 40 cm²

That little² means SQUARED

Why care?

If you need to know how much paint to buy to cover a wall, you need to know the AREA

Multiple Choice

What is the WIDTH of the rectangle?

HINT: 432 DIVIDED BY 36

• 18

• 16

• 13

• 12

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)

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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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Multiple Choice

What is the area of this shape?

• 11 square centimeters

• 32 square centimeters

• 28 square centimeters

• 44 square centimeters

Multiple Choice

Keith made a rectangular sign that had a perimeter of 48 inches.

Which model could represent the sign Keith made?

Multiple Choice

Find the Area

• 24

• 24 yards

• 24 yards²

• 22 yards²

Multiple Choice

The measure of the outside of a shape

• Area

• Perimeter

Multiple Choice

The measure of the inside surface of a shape

• Area

• Perimeter