SaiBook.us Geometry

Lesson

Title: Perimeter of Triangle

Grade: 6-a Lesson: S1-L7

Explanation: Hello students, let us learn a new topic in geometry today with definitions, concepts, examples, and worksheets included.

Lesson:

Definition: Triangle

A triangle is a geometric shape with three straight sides and three angles.

The perimeter of a triangle is the sum of the lengths of its three sides.

An equilateral triangle has all three sides equal in length and all angles congruent, each measuring 60 degrees.

$1$

Explanation: The perimeter of an equilateral triangle is 24 cm.(side is 8)

Definition: Isosceles Triangle

A triangle in which at least two sides have the same length. The angles opposite the equal sides are congruent.

$2$

Explanation: The perimeter of an isosceles triangle is 20 cm.(equal side is 8 cm, base length is 4 cm)

Definition: Scalene Triangle

A scalene triangle has sides of different lengths and angles.

$3$

Explanation: The perimeter of the scalene triangle is 30 cm.(sides are 10 cm , 15 cm ,5 cm)