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Definition1

Title: Perimeter of Triangle(based on angles)

Grade 4+ Lesson s1-l8

Explanation: The best way to understand geometry is by looking at some definitions. Take turns and read each definition for easy understanding.

Definition

Topics → Definition Example1

Definition: Acute angle Triangle

A triangle is a three-sided polygon with three angles and three vertices.
A triangle with all three angles is acute, meaning they are less than 90 degrees each.
The perimeter of an acute triangle adds up the lengths of its three sides.

$1$

Explanation:

This image shows an acute-angle triangle.

Definition: Right angle Triangle

A triangle with one angle measuring exactly 90 degrees is known as a right angle.
The perimeter of a right triangle adds up the lengths of its three sides.

$2$

Explanation:

This image shows a right-angle triangle.

Definition: Obtuse angle Triangle

A triangle in which one angle is obtuse, meaning it is greater than 90 degrees but less than 180 degrees.
The perimeter of an obtuse triangle, you add up the lengths of its three sides.

$3$

Explanation:

This image shows an obtuse angle triangle.