Let's call the left side of this tirangle y and downside z.
3² + 6² = y²
y² = 45
y² + z² = (3 + x)²
45 + z² = 9 + 6x + x²
x² + 6² = z²
45 + x² + 6² = 9 + 6x + x²
45 + x² + 36 = 9 + 6x + x²
45 + 36 - 9 = 6x
72 = 6x
x = 12
9x + 1 + 7x - 9 = 5x - 11
16x - 8 = 5x - 11
11x - 8 = -11
11x = -3
-3/11 = x
Answer:
p = 3
Step-by-step explanation:
This is an isosceles right triangle
=> 2side^2 = (hypotenuse)^2
=> 2p^2 = (3sqrt(2))^2
=> 2p^2 = 18
=> p^2 = 9
=> p = 3
(Unless my math is wrong) it is 390 miles
