Question

the equal sides of the isosceles traingle are 12 cm and the perimeter is 30 cm the area of this traingle is ​

Answer 1

Step-by-step explanation:

perimeter of isosceles triangle = 30cm

length of equal sides = 12cm

let third side of triangle= xcm

x+12+12=30

x+24=30

x=24-30

x= 6

third side of triangle is 6cm

area of triangle =√s(s-a)(s-b)(s-c)

where s =

(a+b+c) ÷ 2

s= 30÷2 = 15

area of triangle = √15(15-12)(15-12)(15-6) cm²

√15×3×3×9 cm²

3×3√15

9√15cm²