Plane Trigonometry
Plane Trigonometry - is the study of the relationships between angles and sides of the plane triangle.
The three vertices lies on the same plane, and the three sides are straight line along the plane
connecting three vertices forming a plane triangle.
Types of triangle based on internal angles.
Right triangle
- having one of its angle is right angle.
=90° <90°
Acute triangle
- having all of its angles are less than 90°.
<90° <90°
Oblique(or obtuse) triangle
- having one of its angle is more than 90°.
>90°
, Types of triangle based on length of sides.
Equilateral triangle - having all sides are equal, means all angles are also equal
(60° + 60° + 60° = 180°), thus we can call this also a equiangular triangle.
Isosceles triangle - having two equal sides, the angle between two equal sides is called the
apex and the two remaining angles are the base angles which are congruent.
Scalene triangle - having no equal sides, all angles are also not equal.
Equilateral Isosceles Scalene
Plane Trigonometry - is the study of the relationships between angles and sides of the plane triangle.
The three vertices lies on the same plane, and the three sides are straight line along the plane
connecting three vertices forming a plane triangle.
Types of triangle based on internal angles.
Right triangle
- having one of its angle is right angle.
=90° <90°
Acute triangle
- having all of its angles are less than 90°.
<90° <90°
Oblique(or obtuse) triangle
- having one of its angle is more than 90°.
>90°
, Types of triangle based on length of sides.
Equilateral triangle - having all sides are equal, means all angles are also equal
(60° + 60° + 60° = 180°), thus we can call this also a equiangular triangle.
Isosceles triangle - having two equal sides, the angle between two equal sides is called the
apex and the two remaining angles are the base angles which are congruent.
Scalene triangle - having no equal sides, all angles are also not equal.
Equilateral Isosceles Scalene
