Question

A isosceles triangle has perimeter 30 cm and each of the equal sides is 12 cm. Find
the area of the triangle.​

Answer 1

Step-by-step explanation:

12×2+x=30

24+x=30

x=30-24

x=6

Answer 2

Perimeter = a + b + c

=> 30 = 12 + 12 + c

=> 30 = 24 + c

=> 30 - 24 = c

.°. c = 6cm

.°. s = 15cm

.°. Area

= √{s(s - a)(s - b)(s -c)}

= √{15(15-12)(15-12)(15-6)}

= √(15 × 3 × 3 × 9)

= √(15 × 9 × 9)

= 9√15 cm²