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Total number of parts of a triangle is
Six: Three sides and three angles
A perpendicular drawn from a vertex to the opposite side of a triangle is known as
An Altitude: An Altitude is defined as the perpendicular drawn from a vertex to the opposite side of a triangle.
A triangle
has three altitudes
Line segment joining the vertices to the mid – points of the opposite side of a triangle is known as
Medians: A median is defined as the line segment joining the vertex to the mid – point of the opposite side of a triangle.
A triangle whose no two sides are equal is called
A scalene triangle: A Scalene triangle is defined as the triangle in which no sides are equal.
A triangle whose two sides are equal is known as
An isosceles triangle: An isosceles triangle is a triangle that has two equal sides.
A triangle whose two sides are equal is called
An equilateral triangle is defined as a triangle whose all sides are equal.
The sum of the lengths of side of a triangle is known as its
Perimeter: Perimeter is defined as the sum of the length of all the sides of a triangle
A triangle having all sides of different length is known as its
Scalene triangle: A Scalene triangle is defined as a triangle having all sides of different length.
A triangle whose one angle is more than 90° is called
An obtuse triangle: An obtuse triangle is a triangle whose one angle is more than 90o
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Chapter 12: Triangles Exercise 12.1 Question: 1...