Definition: Rectangle A rectangle is a quadrilateral with four right angles.

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Transcript of Definition: Rectangle A rectangle is a quadrilateral with four right angles.

Definition: Rectangle

A rectangle is a quadrilateral with four right angles.

Area: Rectangle

L = LengthW = WidthArea = L x W sq units

L

W

Example: Rectangle

Area = 9 ft x 3 ftArea = 27 sq ft

3 ft

9 ft

Definition: Square

A square is a quadrilateral with four congruent sides and four

right angles.

Area: Square

S = Length of each sideArea = S x S sq units

S

Example: Square

Area = 8 cm x 8 cmArea = 64 sq cm

8 cm

Definition: Triangle

A triangle is a polygon with three sides.

Area: Triangle

B = BaseH = HeightArea = ½ B x H sq units

B

H

B

H

Example: Triangle

Area = ½ x 12 ft x 6 ftArea = 36 sq ft

12 ft

6 ft

Definition: Trapezoid

A trapezoid is a quadrilateral with only two sides parallel.

Area: Trapezoid

B1 = Base 1B2 = Base 2H = HeightArea = ½ x (B1 + B2) x H sq units

B2

B1

H

Example: Trapezoid

Area = ½ x (4m + 8m) x 5 mArea = 30 sq m

8 m

5 m

4 m

Definition: Circle

A circle is a set of all points in a plane that are an equal distance from its

center.

Area: Circle

r = radiusArea = r 2 sq units

r

Example: Circle

Area = r 2 sq units 3.14Area = 3.14 x (6 in.)2

Area = 3.14 x 36 sq in.Area = 113.04 sq in.

6 in.

Try these problems on

your own.

Find the area of the rectangle below.

Area = 7 ft x 5 ftArea = 35 sq ft

5 ft

7 ft

Find the area of the square below.

Area = 11 cm x 11 cmArea = 121 sq cm

11 cm

Find the area of the figure below.

Area = ½ x 9 ft x 4 ftArea = 18 sq ft

9 ft

4 ft

Find the area of the figure below.

Area = ½ x (7m + 11m) x 6 mArea = 54 sq m

11 m

6 m

7 m

Find the area of the circle below.

Area = r 2 sq units 3.14Area = 3.14 x (8 in.)2

Area = 3.14 x 64 sq in.Area = 200.96 sq in.

8 in.

Find the area of the rectangle below.

Area = 2.7 ft x 4.5 ftArea = 12.15 sq ft

2.7 ft

4.5 ft

Find the area of the square below.

Area = 6.5 cm x 6.5 cmArea = 42.25 sq cm

6.5 cm

Find the area of the figure below.

Area = ½ x 7.8 ft x 3.1 ftArea = 12.09 sq ft

7.8 ft

3.1 ft

Find the area of the figure below.

Area = ½ x (3.6m + 8.4m) x 6.2 mArea = 37.2 sq m

8.4 m

6.2 m

3.6 m

Find the area of the circle below.

Area = r 2 sq units 3.14Area = 3.14 x (17 in.)2

Area = 3.14 x 289 sq in.Area = 907.46 sq in.

17 in.