Trigonometry Key Formulas.

Quadrant problems

*Remember the mnemonic Add Sugar To Coffee. *Make sine as your reference

Area of Triangle with Three sides given.

ALSO CALLED HERONS FORMULA

Relation between 2 sides of triangle altitude on the 3rd side and radius of circumscribing circle

Altitude *Line na mula sa vertex na dapat ay perpendicular sa opposite side.

Length of an Bisector Angle

Angle Bisector *Splits the angle into two congruent angles. *Incenter ang intersection. *Figure is circle inscribed in triangle.

Length of Median

Median: *Line na mula sa vertex hanggang midpoint ng opposite side. *Centroid ang intersection

Perpendicular bisector of the sides of a triangle

Perpendicular bisector *Create a right angle at the midpoint of each segment. *Circumcenter ang midpoint.