NCERT Class 9 Solutions: Triangles (Chapter 7) Exercise 7.2 – Part 4

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Interior Angle

Give interior angle of two parallel line when two lines are …

Give Interior Angle

When two lines are cut by a third line (transversal), then the angles formed inside the lines are called Interior Angles.

Q-7 ABC is a right angled triangle in which and . Find and

Solution:

ABC is a Right Angled Triangle

Given, and

  • Now, (Angles opposite to the equal sides are equal.)

  • Now, (Sum of the interior angles of the triangle.) (

  • Thus,

Q-8 Show that the angles of an equilateral triangle are each.

Solution:

ABC be an Equilateral Triangle

Give, ABC be an equilateral triangle.(Length of all sides is same) (Sides opposite to the equal angles are equal.)

  • Also, (Sum of the angles of the triangle.) ( )

  • Therefore,

  • Thus, the angles of an equilateral triangle are each.