Everything Maths Grade 10

Name Diagram Properties

Scalene

C

B

䄀

All sides and angles are different.

Isosceles

C B

䄀

Two sides are equal in length.

The angles opposite the equal

sides are also equal.

Equilateral

A B

䌀

60 ◦ 60 ◦

60 ◦

All three sides are equal in length

and all three angles are equal.

Acute

C

B

䄀

Each of the three interior angles

is less than 90 °.

Obtuse

C

B

䄀

One interior angle is greater than

90 °.

Right-angled

A C

䈀

hypotenuse

One interior angle is 90 °.

Different combinations of these properties are also possible. For example, an obtuse isosceles triangle and a
right-angled isosceles triangle are shown below:

obtuse isosceles

right-angled isosceles

VISIT:

This video shows the different ways to classify triangles.

See video:2G69atwww.everythingmaths.co.za

Chapter 7. Euclidean geometry 243