Question

find the area of a triangle whose sides are 9 CM 12 cm and 15 CM​

Answer 1

Step-by-step explanation:

Given that

sides of the traingle

9Cm , 12Cm and 15Cm .

Area of the traingle = 1/2 × b × h

===> 1/2 × 12 × 9

===> 6 × 9

===> 54Cm2

❤️Lucky❤️

Answer 2

$\Large{\textbf{\underline{\underline{According\;to\;the\;Question}}}}$

Given,

Sides of Triangle :-

p = 9 cm

q = 12 cm

r = 15 cm

Now,

Semi Perimeter :-

s = (p + q + r)/2

s = (9 + 12 + 15)/2

s = 36/2

s = 18 cm

Now,

Using Heron formula :-

A = √s(s - a)(s - b)(s - c)

A = √18(18 - 9)(18 - 12)(18 - 15)

A = √18 × 9 × 6 × 3

A = √(2 × 9) × (9) × (2 × 3) × (3)

A = √(2 × 2) × (9 × 9) × (3 × 3)

A = 2 × 9 × 3

A = 54 cm²

Therefore,

Area of triangle = 54 cm²