Classifying Triangles

Wala: Triangles

L.O: Classifying Triangles.

Real life application of triangles.

Traffic signs form the most commonly found examples of the triangle in our everyday life. The signs are in equilateral triangular shape; which means that all three sides are of equal lengths and have equal angles.

Real life application of triangles.

Pyramids are the ancient monuments constructed by Egyptians. They are tetrahedral in shape, i.e., have four triangular sides which converge into a single point at the top.

Real life application of triangles.

Truss bridges have supporting structures constructed in triangular shapes. Triangles are used in supporting the structure of the bridges because they evenly distribute the weight without changing the proportions.

Real life application of triangles.

Almost every boat nowadays have a triangular sail.

The roofs of the houses are made in the triangle shape. The roof truss is an obtuse-angled triangle.

The construction of the staircase involves knowledge about right angles. The staircase is built in a triangular shape, mostly at right angle triangle.

Definition of a triangle.

A triangle is a three-sided and two-dimensional closed structure. It is a polygon with three corners, vertices and three angles joined together forming a closed structure.

Whole class activity.

Each student to find at least one shape which is triangular. Draw and name it.

Group activity.

Room 1 - Q 1

Room 2 - Q 2

Room 3 - Q 3

Room 4 - Q4

Presentation.

Each group presents.

Plenary.

Name types of triangle - use angle and side