Types
of Triangle
- Equilateral triangle: Has 3 sides of equal length and three equal angles (Always 60 degrees).
- Equiangular Triangle: All three angles are equal.
- Isosceles triangle: Has 2 sides of equal length and two equal angles.
- Scalene triangle: Has no sides of equal length and no equal angles.
- Acute triangle: All angles are less than 90 degrees
- Right triangle: One angle are 90 degrees.
- Obtuse triangle: One angle is more than 90 degrees.
Types of Angles
- Acute Angle: An angle less than 90 degrees
- Obtuse Angle: An angle more than 90 degrees but less than 180 degrees
- Right Angle: An angle equaling 90 degrees
- Straight Angle: An angle equaling 180 degrees
- Reflex Angle: An angle more than 180 degrees but less than 360 degrees
- Interior Angle: The three angles on the inside of a triangleExterior Angle: The angle between a side of a triangle and the extension of an adjacent side.
A triangle can be more than one type at the same time.
For example:
- A scalene triangle can have one interior angle 90 degrees, (making it also a right triangle) and is called a "right scalene triangle"
- An isosceles triangle has a right angle is called a "right isosceles triangle"
Formula for Perimeter of a Triangle:
The
perimeter is the distance around the edge of the triangle.
Perimeter
= A+B+C
Formula for Area of a triangle
The
area is half of the base times height.
Area =1/2bh or A=bh/2
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Facts
1.
A
triangle has three sides and three angles.
2.
The
three angles always add to 180 degree.
3.
The sum of the lengths of any two sides of
a triangle is always longer than the third side.
4.
The longest side of a right angle triangle
is called the hypotenuse, it is always found opposite the right angle.
5. The shortest side is always opposite the smallest interior angle
6.
The longest side is always opposite the largest interior angle.
7.
The interior angles of
a triangle always add up to 180°
8.
The exterior angles of
a triangle always add up to 360°
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