Question

the base of an isosceles triangle is 18 cm and its perimeter is 38 cm find the area of triangle

Answer 1

answer is 19\ 9. because we put x as as other sidr

Answer 2

Perimeter of a triangle = Sum of all three sides.
Now,if we suppose third side to be the side which is not same to any other side. if we suppose other side to be x.
$38 = 2x + 18 \\ 2x = 38 - 18 \\ 2x = 20 \\ x = 20 \div 2 \\ x = 10$