Question

If the perimeter is 21 cm and the unequal side is 9 cm, then the area of an isoceles triangle will be what

Answer 1

Answer:

6 cm

Step-by-step explanation:

Let one of the equal sides be x

then the other equal side will also be x

3rd side = 9 cm

perimeter of triangle = side1 + side2 + side3

perimeter of triangle = x + x + 9

21 = 2x +9 (∵ perimeter of the triangle is given = 21 cm)

21 - 9 = 2x

12 = 2x

12/2 = x

6 = x

∴ The equal sides of the isosceles triangle are 6 cm each.