Can someone please help me with this?

Step-by-step explanation:

As we can see it is a right angled triangle so

hypotenuse (h) = 14 . 7 km

perpendicular (p) = 11.9 km

base (b) = x

Now by using Pythagoras theorem

Hope  it was helpful.:)

all it means is function 3

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.