Apply the Pythagorean Theorem to find the distance between points A and C.

the horizontal distance ( x direction) from A to C is 7 units and
the vertical distance ( y direction) is 5 units
Applying Pythagoras' Theorem to the right triangle
AC² = 7² + 5² = 49 + 25 = 74, hence
AC = [tex]\sqrt{74}[/tex] = 8.6 units ( to 1 dec. place )
Hi!
distance from A to the base od C, straight line = 7 units
from the base of C to the point C, straght line = 5 units
[tex]AC^{2} = 7^{2} + 5^{2} \\AC^{2} = 49 + 25\\AC^{2} = 74\\AC = \sqrt{74}\\AC = 8,6[/tex]
Hope this helps!