Question

the base (unequal side)of an isosceles triangle is 4 cm and its perimeter is 20 cm find its area

Answer 1

the area of the isosceles triangle is 4 root over 15

Answer 2

perimeter=2x+4=20
2x=16
x=8
by herons formula,
area=root of(10(10-8)(10-8)(10-4)
=root of 240
=4 *root of 15