Line p is parallel to line q. Which proof explains why the sum of the interior angles of the triangle must be 180

In which source of water would a wave travel the fastest? o ice o cold o room temperature o hot mark this and return save and exit next

The rows and columns of lattice points in a three-by-three square array are evenly spaced one unit apart. how many distinct triangles with at least one side of length 2 units can be drawn using three lattice points for the vertices?

How do i do this? i don’t understand