Can someone answer. there is one problem. you!

Hello,

if we use Heron's formula:

p=(7.2+5.9+11.2)/2=12.15

Area=√(p*(p-a)(p-b)(p-c))
=√(12.15*(12.15-7.2)(12.15-5.9)(12.15-11.2))
=√357,09609375
=18,896986366878714557972599553433≈18.90

So i suppose Answer=D (with an error of 0.01)