Place your 4x4 on the angled slope and then position your level next to it. Slowly tilt the level to find the plumb line, which will be where the bubble lines up in the exact center.

It's a beautiful day to go outside with a kite or a balloon, and compute how wind speed alters their flight.

In this Maths article, learn how to use a formula to find out the internal angles within a polygon.

In this Maths article, learn how to use a formula to find out the internal angles within a polygon.