Verified answer

Answer:

We have

AB=10cm

BC=21cm

CA=17cm

Now,

s=

2

21+17+10

=

2

48

=24

Then

Area of ΔABC=

s(s−a)(s−b)(s−c)

=

24(24−21)(24−17)(24−10)

=

24×3×7×14

=84cm

2

Answer:

The area will be 84 cm² by heron's formula.