Question

If an isoseles triangle has a perimeter of 18 cm and base 8cm then it's area​

Answer 1

Answer:

Divide the triangle into two congruent right angled triangle with hypotenuse 15 cm and base =

2

18

=9cm

With pythagoras theorem : 15

2

=9

2

+h

2

h

2

=225−81=144

h=12

Area of one right angled triangle =

2

1

×b×h =

2

1

×9×12 = 54cm

2

Area of isosceles triangle = 2×54 =108cm

2

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