Question

the unequal sides of an isosceles triangle is 4cm and perimeter is 20cm find its area​

Answer 1

Answer:

Area = H × B

= 20×40

80cm²

Answer 2

Step-by-step explanation:

Let the equal sides be x.

Perimeter = Sum of all sides

20 cm = 2x + 4

x = 8 cm

Height of Isosceles = Altitude

Altitude of Isosceles

= √(Hypotenuse² - (base/2)²)

= √(64 - 4)

= √60

= 2√15cm

Area = 1/2 * base * height

= 1/2 * 4 * 2√15

= 4√15 cm²