Respuesta :

Answer:

D

Step-by-step explanation:

Firstly calculate the semi perimeter s

s = [tex]\frac{7.2+6.7+4.5}{2}[/tex] = [tex]\frac{18.4}{2}[/tex] = 9.2

Substituting values into Heron's formula

A = [tex]\sqrt{9.2(9.2-7.2)(9.2-6.7)(9.2-4.5)}[/tex]

   = [tex]\sqrt{9.2(2)(2.5)(4.7)}[/tex]

   = [tex]\sqrt{216.2}[/tex]

   ≈ 14.704 → D

hlee991

Answer:

The answer is D.

Step-by-step explanation:

plug in the values for the first formula.

[tex]s=\frac{7.2+6.7+4.5}{2}[/tex]

[tex]s=\frac{18.4}{2}[/tex]

s would then equal 9.2.

Then plug in you value for s and the values for a, b, and c into the second equation

[tex]\sqrt{9.2(9.2-7.2)(9.2-6.7)(9.2-4.5)[/tex]

[tex]\sqrt{9.2(2)(2.5)(4.7)[/tex]

[tex]\sqrt{216.2[/tex]

this equals 14.7037 you just have to round up to get 14.704 which is d.

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