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Download RS Aggarwal Solutions Class 9 Maths Chapter 8 Triangles PDF
RS Aggarwal Solutions Class 9 Maths Chapter 8 Triangles
RS Aggarwal Solutions for Class 9 Maths Chapter 8 Triangles – Overview
A triangle is any planar structure that consists of three sides and three vertices. As per the Euclidean geometry, any three non-collinear points form a triangle. Triangle is a planar figure with two dimensions.
- Properties Of A Triangle
- Perimeter of a triangle: 1/2 x Length x Breadth
- Area of a triangle: sum of the lengths of a triangle.
- Interior Angle: 60°
- Sum of interior angles: 180°.
- Types Of Triangles
A triangle can be distinguished on the following basis:
- According to the length of the sides
- According to the measure of internal angles
- According to the Length of Sides
- Equilateral Triangle: All the sides of a triangle are of the same length. All the internal angles are 60°. Let us suppose a Triangle of sides a, b and c.
Equilateral Triangle: a = b = c
- Isosceles Triangle: The two sides of a triangle are of equal length and another side is of different measure.
Isosceles Triangle: a = b but not equal to c
- Scalene Triangle: The sides of a triangle are of unequal length. All the angles are also of different lengths.
- As per the measure of internal angles
- Right-angle triangle: Any triangle with one interior angle of measure 90°.
Right angle triangles obey Pythagoras Theorem which is a2 + b2 = c2
Where a, b, c are the sides of any Triangle.
- Obtuse triangle: Any triangle with anyone interior angle greater than 90°.
- Acute triangle: Any triangle with interior angles less than 90°.
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What is an acute triangle?
Any triangle with interior angles less than 90°.
What is an equilateral triangle?
All the sides of a triangle are of the same length. All the internal angles are 60°. Let us suppose a Triangle of sides a, b and c.
Equilateral Triangle: a = b = c