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Perimeter. The perimeter of a closed plane figure is the length of its boundary. 8cm. 10cm. 7cm. 8cm. 15cm. Perimeter = 15 + 8 + 10 + 8 + 7 = 48cm. Perimeter. Square. Triangles. Rectangle. b=4cm. b. c. L= 8cm. a. L=6cm. P = 8 + 5 + 8 + 5. P = 6 + 6 + 6 + 6.

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perimeter
Perimeter
  • The perimeter of a closed plane figure is the length of its boundary.

8cm

10cm

7cm

8cm

15cm

Perimeter = 15 + 8 + 10 + 8 + 7

= 48cm

perimeter2
Perimeter
  • Square
  • Triangles
  • Rectangle

b=4cm

b

c

L= 8cm

a

L=6cm

P = 8 + 5 + 8 + 5

P = 6 + 6 + 6 + 6

P = a + b + c

P = l + b + l + b

= 2(l + b)

P = l + l + l + l

= 4l or 4s

slide3
Area
  • Area is the space within the boundary of a figure.
area of parallelogram
Area of parallelogram
  • Area of parallelogram = base x height

height

base

area of a triangle
Area of a triangle
  • Area = ½ x base x height

h

h

h

b

b

b

area of trapezium
Area of trapezium
  • Area of trapezium ABCD = area of ΔABC + area of ΔACD

= (½ x BC x AH) + (½ x AD x CK)

= ½ x AH x (BC + AD)

= ½ x height x sum of parallel sides

D

K

A

B

C

H

slide8

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