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Mathinking
1
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Finding the Area
of Triangle,
Trapezoid and
Parallelogram
2
3
What is Area ?
Area is a number of
square unit (sq.) needed
to cover the surface of a
plane figure.
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Triangle
Formula:
Area=base x height
2
4
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Triangle
A=bxh
2
h= 7m
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b= 10m
4
example
4
A=bxh
2
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A=8cmx4cm
2
A=32cm
2
A=16cm2
h=4cm
b= 8cm
Trapezoid
Formula:
.
A=(b1+b2)h
2
5
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Trapezoid
A=(b1+b2) h
2
b1= 8m
h= 4m
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b2= 10m
5
example
A=(b1+b2) h
2
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A=(4m+8m) 6m
2
A=(12m) 6m
2
A=6mx6m
A=36m2
b1= 4m
h= 6m
b2= 8m
5
Parallelogram
Formula:
A=bxh
6
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Parallelogram
A=bxh
h= 5cm
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b= 9cm
6
example
A=bxh
A=bxh
A=12mx9m
2
A=108m
h= 9m
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b= 12m
6
7
Activity!
Determined the formula and find the
Area of each figure.
6m
6m
5m
12m
9m
7m
8m
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Answer!
5m
12m
A=bxh
2
A=12mx5m
2
A=60m
2
A=30m2
7
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7
Answer!
6m
9m
A=bxh
A=9mx6m
2
A=54m
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Answer!
6m
7m
8m
A=(b1+b2) h
2
A=(6m+8m) 7m
2
A=(14m) 7m
2
A=7mx7m
A=49m2
7
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Remember
8
The formula in finding the area of triangle is:
● A=bxh
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2
in trapezoid:
● A=(b1+b2) h
2
and last in parallelogram:
● A=bxh
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1.
6m
2.
5m
6m
9m
12m
3.
4.
12m
5.
23m
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H= ?
10m
Area= 90 m2
8m
10m
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Assignment
Directions:Find its area
1.
A field in the shape of a triangle with a base
of 15 m and a height of 9m. What is area?
2.
A garden in the figure of parallelogram has
a base of 12m and a height of 7m. Find the
area of the garden
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