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Questions and Answers
What is the sum of interior angles of a triangle?
What is the sum of interior angles of a triangle?
- 270 degrees
- 90 degrees
- 360 degrees
- 180 degrees (correct)
What type of angle measures between 90 and 180 degrees?
What type of angle measures between 90 and 180 degrees?
- Straight angle
- Obtuse angle (correct)
- Acute angle
- Right angle
What is the name of an angle that measures exactly 90 degrees?
What is the name of an angle that measures exactly 90 degrees?
- Right angle (correct)
- Straight angle
- Obtuse angle
- Acute angle
What is the name of an angle that measures more than 180 degrees but less than 360 degrees?
What is the name of an angle that measures more than 180 degrees but less than 360 degrees?
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In a right-angled triangle, what is the relationship between the two acute angles?
In a right-angled triangle, what is the relationship between the two acute angles?
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What is the name of an angle that measures exactly 180 degrees?
What is the name of an angle that measures exactly 180 degrees?
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Study Notes
Angle Basics
- The sum of interior angles of a triangle is 180 degrees.
Types of Angles
- An angle that measures between 90 and 180 degrees is an obtuse angle.
Right Angles
- An angle that measures exactly 90 degrees is a right angle.
Reflected Angles
- An angle that measures more than 180 degrees but less than 360 degrees is a reflex angle.
Right-Angled Triangles
- In a right-angled triangle, the two acute angles are complementary, meaning they add up to 90 degrees.
Straight Angles
- An angle that measures exactly 180 degrees is a straight angle.
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