Find the Unknown Marked Angles in the Given Figure :

Find the unknown marked angles in the given figure:

Sum

We know that in a triangle if one side of it is produced, then

Exterior angle = sum of its interior opposite angles.

In fig., 110° = x° + 30°

⇒ x° = 110°− 30° = 80°

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Concept for Exterior Angle Property

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Chapter 15 Triangles
Exercise 15 (A) | Q 12.1

Find the unknown marked angles in the given figure:

Apply the properties of isosceles and equilateral triangles to find the unknown angles in the given figure:

Apply the properties of isosceles and equilateral triangles to find the unknown angles in the given figure:

Apply the properties of isosceles and equilateral triangles to find the unknown angles in the given figure: