Chapters

In a triangle there are two kinds of angles:

The interior angles are formed by two sides.

The exterior angles are formed on one side and its extension.

Properties of the Angles of a Triangle

1. The sum of the interior angles of a triangle equals 180°.

A + B + C = 180º

2.  The value of an exterior angle of a triangle equals the sum of the two nonadjacent interior angles.

α = B + C

3.   The interior and exterior angles of a triangle at a particular vertex are supplementary, that is to say, they add up 180º.

α = 180º - A

The best Maths tutors available
1st lesson free!
4.9 (26 reviews)
Intasar
£36
/h
1st lesson free!
5 (17 reviews)
Matthew
£25
/h
1st lesson free!
4.9 (13 reviews)
Paolo
£25
/h
1st lesson free!
4.9 (7 reviews)
Dr. Kritaphat
£49
/h
1st lesson free!
5 (28 reviews)
Ayush
£60
/h
1st lesson free!
4.9 (9 reviews)
Petar
£27
/h
1st lesson free!
5 (14 reviews)
Farooq
£40
/h
1st lesson free!
5 (9 reviews)
Tom
£22
/h
1st lesson free!
4.9 (26 reviews)
Intasar
£36
/h
1st lesson free!
5 (17 reviews)
Matthew
£25
/h
1st lesson free!
4.9 (13 reviews)
Paolo
£25
/h
1st lesson free!
4.9 (7 reviews)
Dr. Kritaphat
£49
/h
1st lesson free!
5 (28 reviews)
Ayush
£60
/h
1st lesson free!
4.9 (9 reviews)
Petar
£27
/h
1st lesson free!
5 (14 reviews)
Farooq
£40
/h
1st lesson free!
5 (9 reviews)
Tom
£22
/h

Acute Triangle

An acute triangle has three acute angles.

Right Triangle

A right triangle has a right angle.

The longest side of the triangle is called the hypotenuse.

The shorter sides of the triangle are the legs or catheti (singular: cathetus).

Obtuse Triangle

An obtuse triangle has an obtuse angle.

Need a Maths teacher?

Did you like the article?

5.00/5 - 1 vote(s)