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UDAYA COLLEGE OF EDUCATION
UDAYA NAGERAMMANDIVILAI
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NAME NAME : A AMMU : A AMMU
BITIYABITIYA
SUBJECTSUBJECT : MATHEMATICS: MATHEMATICS
ROLL NOROLL NO ::
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Angles and Triangles
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Angles
A shape formed by two rays sharing a common endpoint; contains two rays and a vertex
ray
ray
vertex
ray—has one endpoint and goes infinitely in one direction
vertex—point common to two rays of a triangle or two sides of a polygon
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Types of Angles
Acute angle: An angle whose measure is greater than zero degrees and less than 90 degrees
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Example
1
2
3
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Types of Angles
Right angle: Angle that measures 90 degrees
Example:
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Types of Angles
Obtuse angle: One angle measures greater than 90 degrees and less than 180 degrees
Example :
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Straight Angle
Straight angle: A line that goes infinitely in both directions and measures 180 degrees
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Types of Triangles
Equilateral triangle: A triangle with three congruent (equal) sides and three equal angles
These marks indicate equality.
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Types of Triangles
Isosceles triangle: A triangle with at least two congruent (equal) sides
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Types of Triangles
Right triangle: Has only one right angle (90 degrees)
This box indicates a right angle or a 90-degree angle.
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Types of Triangles
Scalene triangle: A triangle that has no congruent (equal) sides
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Types of Triangles
Name each type of triangle
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2
3
4
Equilateral
Right
Isosceles
Scalene
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Interior Angles
Interior angles: An interior angle (or internal angle) is an angle formed by two sides of a simple polygon that share an endpoint
Interior angles of a triangle always equal 180 degrees.
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