Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X =...

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Find the perimeter.

Transcript of Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X =...

Page 1: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

Find the perimeter.

Page 2: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

Areas

Grade 7 - CIC

Page 3: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

10 Apr 2023

Area of a Rectangle

3 1

24 3

3

3

612

X =X =X =

B Ah

B

B

hh

B

h

B = base

h = height

Must learn formula !

1 cm

Area = base x heightA = B x h

Page 4: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

Find the area of each rectangular shape below.

100 m

50 m

120 m

40 m

1 2

34

5

8½ cm

5½ cm

90 feet

50 feet

210 cm

90 cm

Not to scale.

5 000 m2

4500 ft2

4 800 m2

46.75 cm2

18 900 cm2

Page 5: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

base

height

base

height

Area of a Parallelogram

The area of a parallelogram

= the area of a rectangle on the

same base.Area = base x height

Area = base x height

Page 6: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

8 cm

14 mm

1.5 m

12 cm

5 mm

2.1 m

Find the area of each parallelogram below.1

2

3Area = 8 x 12

= 96 cm2

Area = 14 x 5

= 70 mm2

Area = 1.5 x 2.1

= 3.15 m2

Page 7: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

base

height

Area of a triangle = ½ base x height

Area of a Triangle

The area of a triangle = ½ the area of the surrounding rectangle/parallelogram

Page 8: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

Area of a Triangle

rectangle area = 2 + 2 triangle area = ½ rectangle area

base

height

Area of a triangle = ½ base x height

The area of a triangle = ½ the area of the surrounding rectangle/parallelogram

Page 9: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

Area = ½ x 8 x 9

= 36 cm2

Area = ½ x 10 x 12

= 60 cm2

Area = ½ x 14 x 16

= 112 cm2

Area = ½ x 3.2 x 4.5

= 7.2 m2

Find the area of the following triangles.

8 cm 10 cm

14 cm

12 cm9 cm 16

cm

Area = ½ b x h

3.2 m

4.5 m

7 mm

5 mm

Area = ½ x 7 x 5

= 17.5 mm2

Page 10: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

The Area of a Trapezium

Area = ½ the sum of the parallel sides x the perpendicular height

A = ½(a + b)h

a

b

h

b

½h

a

Area of trapezium = area of parallelogram

A = ½(a + b)h

Page 11: Find the perimeter. Areas Grade 7 - CIC 15-Feb-14 Area of a Rectangle 31 2 43 3 3 6 12 X = X = X = BAh B B h h B h B = base h = height Must learn formula.

The Area of a Trapezium Area = ½ the sum of the parallel sides x the perpendicular height

A = ½(a + b)h

a

b

h½ah

½bhArea = ½ah + ½bh = ½h(a + b)

= ½(a + b)h

Area = ½ (8 + 12) x 9

= ½ x 20 x 9

= 90 cm2

Area = ½(7 + 5) x 6

= ½ x 12 x 6

= 36 cm2

Find the area of each trapezium

1

8 cm

12 cm

9 cm

25 cm

7 cm

6 cm

3

5 cm

3.9 cm

7.1 cm

Area = ½(3.9 + 7.1) x 5

= ½ x 11 x 5

= 27.5 cm2


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