Perimeter and Area of Geometric Figures
Perimeter
The perimeter of a closed plane figure
is the length of its boundary.
15cm
10cm
8cm
7cm
8cm
Perimeter = 15 + 8 + 10 + 8 + 7
= 48cm
Perimeter
Rectangle
Square
Triangles
P = 8 + 5 + 8 + 5
P = l + b + l + b
= 2(l + b)
L= 8cm
P = 6 + 6 + 6 + 6
P = l + l + l + l
= 4l or 4s
L=6cm
b
=
4
c
m
a
b
c
P = a + b + c
Area
Area is the space within the boundary
of a figure.
Area of parallelogram
Area of parallelogram = base x height
base
height
Area of a triangle
Area = ½ x base x height
b
b
h
h
h
b
Area of trapezium
Area of trapezium ABCD
= area of
Δ
ABC + area of
Δ
ACD
= (½ x BC x AH) + (½ x AD x CK)
= ½ x AH x (BC + AD)
= ½ x height x sum of parallel sides
A
D
C
H
B
K
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Explore the concepts of perimeter and area in geometric figures including squares, triangles, rectangles, parallelograms, and trapeziums. Learn how to calculate the perimeter and area of these shapes through simple formulas and examples provided in an informative presentation. Visual aids will aid in enhancing comprehension.
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Presentation Transcript
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 P = a + b + c P = l + b + l + b P = l + l + l + l = 2(l + b) = 4l or 4s
Area Area is the space within the boundary of a figure.
Area of parallelogram height base Area of parallelogram = base x height
Area of a triangle h h h b b b Area = x base x height
Area of trapezium D K A B C H Area of trapezium ABCD = area of ABC + area of ACD = ( x BC x AH) + ( x AD x CK) = x AH x (BC + AD) = x height x sum of parallel sides
This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.
