Triangles and its Angles Class 7 Maths

A triangle is a closed figure made of three line segments.

Triangles can be classified in 2 ways, according to angles and according to length of the sides.
According to angles, there are three types of triangles – acute, right, and obtuse-angled triangle.
According to length of sides, triangles can be classified as – Scalene, Isosceles, and Equilateral triangle.

The types of Triangle-based on Sides are:

EQUILATERAL TRIANGLE:
A triangle having all the three sides of equivalent length is called an equivalent triangle.

If we divide 180º by the triangle’s number of sides to determine the three angles’ measurements, we will get 60º. Each of the equilateral triangle’s angle measures 60º.

ISOSCELES TRIANGLE:
A triangle having any 2 sides of equivalent length is an Isosceles triangle.

The two opposite angles of equal sides are also equal in an isosceles triangle. The side that is different is located precisely between the equal angles.

SCALENE TRIANGLE:
A triangle having three sides of different lengths is known as a scalene triangle.

The types of Triangle-based on Angles are:

ACUTE ANGLED TRIANGLE:
A triangle whose all angles are less than 90 degrees is called an acute angled triangle or Acute triangle

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