Yes, it is.
The 3 sides have different lengths
A scalene triangle has 3 sides of different lengths An isosceles triangle has 2 sides of equal lengths An equilateral triangle has 3 sides of equal lengths
Yes
An isosceles triangle has 3 sides 2 of which are equal in lengths An equilateral triangle has 3 sides all of which are equal in lengths
The perimeter of any triangle is the sum of its 3 sides
An Accute Triangle
It is a scalene triangle that has 3 sides of different lengths
An equilateral triangle has 3 sides of the same lengths.
If the lengths of its 3 sides are equal then it is an equilateral triangle.
A scalene triangle has 3 sides of different lengths
A triangle that has 3 sides of unequal lengths is called a scalene triangle.
-- Measure or calculate the length of each of its 3 sides. -- Add the lengths of its 3 sides. -- The sum is the perimeter of the triangle.