Solve a collision of balls in two dimensions using the conservations of momentum in this video. Video discusses how specifically to use trigonometry to solve the direction and velocity of the balls after the collision. [9:32]

A video [48 mins, 48 sec] explaining 21 different math concepts to help students prepare for the ACT including; circumference; averages; probability; multiplication counting principle; functions; circles; percentages; factoring; rules of...

The video from Khan Academy provides practice questions for the SAT. Watch Sal work through a harder angles, arc lengths, and trig functions problem.

The video from Khan Academy provides practice questions for the SAT. Students will watch Sal work through a basic angles, arc lengths, and trig functions problem.

The concept of the cosecant of an angle is introduced in this lesson.