An equilateral triangle has the same degree of angles and all sides are the same length


An isoscles triangle has 2 and only 2 sides of equal length

Right Trianlge

A right triangle has one 90 degree angle. The relation between the sides and angles of a right triangle is the basis for trigonometry

Angle measures

Angles can be either straight, right, acute or obtuse. An angle is a fraction of a circle where the whole circle is 360°. A straight angle is the same as half the circle and is 180° whereas a right angle is a quarter of a circle and is 90°. You measure the size of an angle with a protractor.


Two shapes are congruent if its the same size and shape and in other words the shapes have the same degree angles and same length of sides.


Orthocenter: Where the triangle's three altitudes intersect. The altitude of a triangle is a segment from a vertex of the triangle to the opposite side. The opposite side is the base


The circumcenter is the center of a triangle's circumcircle. It can be found as the intersection of the perpendicular bisectors.


A centroid of a triangle is the point where the three medians of the triangle meet. A median of a triangle is a line segment from one vertex to the mid point on the opposite side of the triangle.


The incenter is always inside the triangle. It is constructed by taking the intersection of the angle bisectors of the three vertices of the triangle.
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Isaac Martinez


Created with images by Brett Jordan - "Triangles #9" • fdecomite - "Take an equilateral triangle and cut it into three similar parts, just two of which are congruent"

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