Class 9 Exam  >  Class 9 Notes  >  Lab Manuals for Class 9  >  Vice Voca: Verify Exterior Angle Property of a Triangle

Vice Voca: Verify Exterior Angle Property of a Triangle | Lab Manuals for Class 9 PDF Download

Q.1. What is the sum of exterior angles of a triangle?

We know that the sum of exterior angles of a polygon is always 360°. The sum of exterior angles of a triangle is 360°.


Q.2. What is the angle form by straight line?

The straight line always form a angle of 180°.


Q.3. How would you define an exterior angle property of a triangle?

An exterior angle of a triangle is equal to sum of opposite interior angles.


Q.4. Does an exterior angle of a triangle is smaller than either of its interior opposite angles?

No, an exterior angle of a triangle is greater than either of its opposite interior angles.


Q.5. What do you mean by the linear pair axiom?

If a ray stands on a line, then the sum of the two adjacent angles so formed is 180° and vice-versa. This property is known as linear pair axiom.


Q.6. What would be the measure of exterior angle for each vertex of equilateral triangle?

120° (=60°+ 60°).


Q.7. If the exterior angle of a triangle is 90°, then what would be the opposite interior angles, supplementary or complementary?

Complementary


Q.8. If the sum of interior opposite angles of a triangle is 130°, then what would be the measure of its exterior angle?

Sum of interior opposite angles = Exterior angle Exterior angle = 130°.


Q.9. What is the condition of exterior angle of a triangle?

The exterior angle of a triangle is equal to the sum of opposite interior angles.

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