User:Sasha-Gaye

Triangles

 * A triangle has three sides and three angles.


 * The three angles always add to 180°

Types of Triangles
Equilateral, Isosceles and Scalene

There are three special names given to triangles that tell how many sides (or angles) are equal.

There can be 3, 2 or no equal sides/angles:

Three equal sides Three equal angles, always 60°

Two equal sides Two equal angles

No equal sides No equal angles have names that tell you what type of angle is inside: AcuteTriangle
 * Triangles can also

All angles are less than 90°

Right Triangle

Has a right angle (90°)

Obtuse Triangle

Has an angle more than 90° two names, for exame: Has a right angle (90°), and also two equal angles
 * Sometimes a triangle will have

Perimeter
The perimeter is the distance around the edge of the triangle: just add up the three sides.

Area
The area is half of the base times height.

"b" is the distance along the base

"h" is the height (measured at right angles to the base)

Area = ½ × b × h

Another way of writing the formula is bh/2
 * The base can be any side, Just be sure the "height"is measured at right angles to the "base"