Tomorrow:

How to find the lenght of a side if we know just one side and two angle values?

- QuestionsareAnswered

Trignometry- Sine, COS, Tangent

In a right-angled triangle, the size of any angle is related to the ratio of the lengths of any two sides by the trigonometric functions. The basic functions are sine, cosine, and tangent.
These functions are based on the similarity of triangles that have a right angle and one other angle in common. Imagine an angle A formed by the intersection of lines AB and AC (see above). A third line drawn perpendicularly up from AC gives a right-angled triangle. The sides of such a triangle will always be in the same ratio to one another, no matter where the third line intersects AC.

Sine
The sine of angle A is the ratio of the lengths BC to AB.

Cosine
The cosine of angle A is the ratio of the lengths AC to AB.

Tangent
The tangent of angle A is the ratio of the lengths BC to AC.

What is the use of tail Blade in Helicopter

The Tail Rotor :
The tail rotor is very important. If you spin a rotor using an engine, the rotor will rotate, but the engine and the helicopter will try to rotate in the opposite direction.

This is called TORQUE REACTION.

The tail rotor is used like a small propeller, to pull against torque reaction and hold the helicopter straight.Without the Tail Rotor, the Helicopter will start rotating in the direction opposite to that of the mail Rotor once it takes off.

It's enough to destory the small tail rotor to crash a big Helicopter.