Question

find the area of a triangle whose sides are 11 cm,9cm and 4cm​

Answer 1

Explanation:

Here you can use Heron's formula

first let's find s

s= a+b+c

2

= 11cm+9cm+4cm

2

= 24cm/2= 12cm

Now,

Area= ✓s(s-a)(s-b)(s-c)

=✓12cm(12-11)cm(12-9)cm(12-4)cm

= ✓12cm×1cm×3cm×8cm

= ✓288cm⁴

= 16.97cm²