The equation of ellipse:

The formula of c (the distance to the foci)

<h3>Answer: c² + b² = a²</h3>
I can probably help, but what do you know already about this ?
Answer:
x=7
Step-by-step explanation:
The sum of the arc of a circle is 360 degrees
85+5x+5+10x+5+-7+6x+6+17x = 360
Combine like terms
38x+94=360
Subtract 94 from each side
38x+94-94 = 360-94
38x = 266
Divide each side by 38
38x/28 = 266/38
x = 7
Multiply it by 16/5, or the reciprocal