find the area of isosceles triangle is the perimeter is 11 cm and the base is 5 cm
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We know that ,
Two sides of an isosceles triangle is equal
So, 5cm+x+x=11
5cm+2x=11
2x=11cm-5cm
2x=6cm
x=3cm
So equal sides =3cm
Area of the isosceles triangle =√5.5(5.5-3)(5.5-3)(5.5-5)
=√5.5×2.5×2.5×0.5
=√17.1875
=4.146 cm^2
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