Trigonometry

Trigonometry - Basic concepts

Trigonometry (whose term derives from the Greek τριγωνοϛ trigōnos "triangle" and μετρον metron "measure") is a branch of mathematics that deals with ...

Congruent angles

Α and β are said to be congruent angles if they measure the same. These have wide application in the similarity and congruence of ...

Reference angle

A reference angle is a positive acute angle representing an angle θ of any measurement. This is the smallest angle formed ...

Alternate angles

Alternate angles are a set of angles not adjacent to either side of a cross line. It intersects two lines (generally parallel) ...

Vertical angles

In general, vertical angles are those angles opposite each other when two lines intersect. These are always consistent. Definition Vertical angles are ...

External angle

In general, an angle outside, outside or angle outside a polygon is one that is between one side of a polygon and the line ...

Internal angle

In general, an interior or interior angle is an angle within a polygon. This and the exterior angle at the same vertex are ...

Adjacent angles

An angle is the part of the plane between two rays that have a common origin. The rays are called sides and the origin ...

Supplementary angles

Suppose we have two angles α = 60⁰ and β = 120⁰; If we add them together it gives us 180⁰, therefore we say ...

Complementary angles

Suppose we have two angles: If we add them together, it gives us 90⁰, therefore, we say that α and β “complement each other”, that is, ...