### Great, You learnt how to solve for right triangles using sine, cosine, or tangent! Now you have to solve for triangles that are not right, and you can't use none sine, cosine, or tangent the way you had learned before. What can you do now?

### Law of Sines, and Law of cosines are the solution for this quandary. In the course of the lesson you will be introduced to each one of these laws. Don't forget to take advantage of interacting with the lesson trying the suggested problems writing them (stylus) on the screen and using the marker tools menu.You will find the lesson quite interesting indeed!

** Lesson's Content **

** Lesson's Glossary **

**Acute angle **

An angle whose measure is greater than 0 but less than 90 degrees.

**Acute triangle **

A triangle whose angles are acute.

**Cosine **

Ratio determined by the hypotenuse in a right triangle and a side adjacent to a reference angle.

**Equilateral triangle **

A triangle whose sides are equal in length.

**Isosceles triangle **

A triangle with two sides of equal length.

**Proportion **

A statement that two ratios are equal

Proportional

One of four numbers that form a true proportion

**Sine**

Ratio of the length of the opposite side to a reference angle in a right triangle and the hypotenuse. Opposite/hypotenuse.

**Obtuse angle **

An angle whose measure is greater than 90 but less than 180 degrees

**Obtuse triangle **

A triangle with one acute angle.

**Ratio **

A quotient of 2 numbers

**Right triangle **

A triangle that has a 90 degree angle.

**Scalene triangle **

A triangle with no equilateral sides.

**Triangle **

A polygon with three sides.

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