The legs of a right triangle are in the ratio of 3 to 1. If the length of the hypotenuse of the triangle is 40√40, then the perimeter of the triangle is between

A. 14 and 15
B. 13 and 14
C. 12 and 13
D. 11 and 12
E. 10 and 11

Respuesta :

Answer:

[tex] P = 6+2+ \sqrt{40}=14.32[/tex]

So then the best option on this case is:

A. 14 and 15

Step-by-step explanation:

When we have a right triangle we can use the Pythegorean identity given by:

[tex] Hip^2 = Opp^2 +Adj^2[/tex]  (1)

Where Hip represent the hypothenuse. Opp represent the opposite side and Adj the adjacent side.

On this case we have given the hypothenuse assumed [tex] Hip = \sqrt{40}[/tex] because is the only possible reasonable value because [tex] 40\sqrt{40}[/tex] is a too much higher value

We have a ratio provided on this case, let's assume that the ratio is:

[tex] \frac{Opp}{Adj} = 3[/tex]

[tex] Opp = 3 Adj[/tex]

If we rpelace this condition into equation (1) we got:

[tex] (\sqrt{40})^2 = (3Adj)^2 + Adj^2[/tex]

And then we have this:

[tex] 40 = 9 Adj^2 + Adj^2 = 10 Adj^2[/tex]

[tex] Adj = \sqrt{\frac{40}{10}}=2[/tex]

And then the opposite side is:

[tex] Opp = 3 Adj =3* 2= 6[/tex]

The perimeter is defined as the sum of all the sides, we can find the perimeter like this:

[tex] P = Opp + Adj + Hip[/tex]

And replacing the values that we found we got:

[tex] P = 6+2+ \sqrt{40}=14.32[/tex]

So then the best option on this case is:

A. 14 and 15