##
**TRIGONOMETRY:**

**The right Triangle**

- right triangle is a triangle with one angle measures 90

^{0}.

- a geometrical figure with three sides with two rays measures 90

^{0}for an angle.

- a triangle that contains ninety degree angle and no equal sides except for the isosceles right triangle whose two legs are equal.

*Illustration:*

**The six Trigonometric functions of angle A**

Sine A = opposite/ hypotenuse = o / h

Cosine A = adjacent/ hypotenuse = a / h

Tangent A = opposite/adjacent = o / a

Cotangent A = adjacent/ opposite = a / o

Secant A = hypotenuse/ adjacent = h / a

Cosecant A = hypotenuse/
opposite = h / o

^{}