This document defines different types of angles and triangles. It defines complementary angles, supplementary angles, vertical angles, acute angles, obtuse angles, right angles, and congruent angles. It also defines equilateral triangles, isosceles triangles, right triangles, scalene triangles, and describes the properties of each type of triangle including the sum of interior angles. Examples of different types of angles and triangles are provided with labels and definitions.
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Identify
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complementary angles
supplementary angles
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2. Definitions
• Complementary Angle- Two angles whose sum equals 90 degrees.
• Supplementary Angle- Two angles whose sum equals 180 degrees.
• Vertical Angle-A pair of opposite congruent angles formed by intersecting lines.
• Congruent- Having the same size and shape, the symbol for congruent is ≅.
• Congruent Angles- Angles that have the same measure.
• Acute Angle-An angle that measures more than 0∘ and less than 90∘
• Acute Triangle- A triangle where all three angles measure less than 90∘
3. Definitions Continued
• Obtuse Angle-An angle that measures more than more than 90∘ but less than 180∘
• Obtuse Triangle- A triangle containing ONE obtuse angle.
• Right angle- An angle that measures exactly 90∘
• Right Triangle- A triangle with a 90∘ angle.
• Scalene Triangle- A triangle with no congruent sides or angles.
• Isosceles Triangle- A triangle with two congruent sides and angles.
• Adjacent Angles- Angles in the same plane that have a common vertex and side.
• Vertex- On an angle or polygon, the point where the two sides intersect.
9. Two angles that have the same measure are called congruent
angles.
Congruent angles have the same size and shape.
A
B
C
300
D
E
F
300
D
E
F
300
Congruent Angles
10. Once the measure of an angle is known, the angle can be classified
as one of three types of angles. These types are defined in relation
to a right angle.
Types of Angles
A
right angle
m A = 90
acute angle
0 < m A < 90
A
obtuse angle
90 < m A < 180
A
Angle Measure
11. What is a triangle?
• A triangle is a closed geometrical shape with three vertices(points).
• The sum of all angles INSIDE a triangle is 180∘
60∘
60∘ 60∘
12. Types of Triangles
• Equilateral triangle: A triangle with three congruent (equal) sides and three
equal angles
These marks indicate equality.
13. Types of Triangles
• Isosceles triangle: A triangle with at least two congruent (equal) sides
14. Types of Triangles
• Right triangle: Has only one right angle (90 degrees)
This box indicates a right angle or a
90-degree angle.
15. Types of Triangles
• Scalene triangle: A triangle that has no congruent (equal) sides