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)
At 9p.m.(after 4hours)
Step-by-step explanation:
1h. 1h. 1h. 1h
henry:60. 90. 120. 150. 180
gordon:20. 60. 100. 140. 180
you can find it by using this way.i think it will be help for you.