- #1

- 1,421

- 5

## Main Question or Discussion Point

I am reading about uniform circular motion currently, but I am sort of confused by this paragraph:

"We next determine the magnitude of the centripetal centripetal (radial) acceleration, a

I have attached the two figures. Why are the two triangles similar?

"We next determine the magnitude of the centripetal centripetal (radial) acceleration, a

_{r}. Because CA in fig. 5-2a is perpendicular to V_{1}, and CB is perpendicular to V_{2}, it follows that the angle Δθ, defined as the angle between CA and CB, is also the angle between V_{1}and V_{2}. Hence the vectors V_{1}, V_{2}, and ΔV in fig. 5-2b form a triangle that is geometrically similar to the triangle CAB in fig. 5-2a"I have attached the two figures. Why are the two triangles similar?