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( For any Triangle.)

AREA OF THE TRIANGLE

= bh

12_

Let we see how it is true…

WE KNOW THAT AREA OF RIGHT ANGLED

TRIANGLE

B = base of the triangleH = height of the

triangle

= bh

2_1

ALSO WE KNOW THAT TRIANGLES WITH THE

SAME BASE AND BETWEEN THE SAME PARALLELS ARE OF

EQUAL AREA

B C

A D12 ..

.

B C

A

hh

If we move A to point 1then

Here we get an acute angled Triangle.It has same area of the right angled triangle

Therefore area of the acute angled triangle

= bh

2_1

.

B C

A

h

If we move A to point 2then

Here we get an obtuse angled Triangle.It has same area of the right angled triangle

Therefore area of the obtuse angled triangle

= bh

2_1

Thank you