Trigonometry is the division that deals with study of plane and spherical triangles. Plane trigonometry consists of 2 dimensional triangles the ones that we can draw on the paper.or we can say Plane trigonometry is the sub division of trigonometry in which its principles are applied to the plane triangles.If enough sides and angles are known we can calculate the remaining sides and angles as well as area and hence we can solve the triangles. Triangles can also be solved by the law of sine and law of cosines.
Important things to remember
1) Pythagorean theorem
2) Trignometric Functions
3) law of Sines and Cosines
4) Trigonometric identities
5) Half and double angle formula
Do you need to know more about kinds of triangles .
Basic Formulas Used in Plane Trigonometry
Pythagorean theorem
As square of the hypotenuse is = sum of the squares of the other 2 sides in the Right Triangle.The hypotenuse is the longest side.if two sides of triangles are given as a and b and hypotenuse = c so according to the theorem
From the above right triangle we have ( hypotenuse)2= (leg)2+ (height)2
c2= a2+ b2
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