Question

The floor of conference hall is made in a shape of ellipse. If the largest

chord has length 20 meters and the smallest is 16m what is the length
between the foci?
A. 24m B. 12m C .9root2 m D. 6m​

Answer 1

B. 12 m.

Explanation:

The focal length f is related to the semi minor axis (b) and the semi major axis (a) as follows: f^2 = a^2 - b^2.

Here we have a = 1/2* 20 = 10 and b = 1/2 * 16 = 8.

f^2 = 10^2 - 8^2 = 36

so f = 6.

So the length between the focii is 2*6 = 12m.

Answer 2

b

Explanation:

I'm pretty sure but have a good day loves