Question

1. Find the area of a triangle whose sides
are 12 cm, 6 cm and 15 cm.
​

Answer 1

Answer:

For finding semi perimeter -

a+b+c

—-—— = 12+6+15

2 ——----—---

2

So you will get - 33

—--

2

Now we use herons formula for getting area of triangle =

\sqrt{s(s - a) \: (s - b) \: (s - c)}

s(s−a)(s−b)(s−c)

Answer 2

Step-by-step explanation:

s = (a+b+c) /2

= (12+6+15)/2

= 16.5 cm

area of a triangle = √ s ( s-a) (s-b) (s-c)

= √16.5(16.5-12)(16.5-6)(16.5-15)

=√ 16.5 ×4.5×10.5×1.5

=√ 1169.4375

= 34.192 cm².