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Maths CBSE Live product
Class 7 (2025-26)
A Tale of Three Intersecting lines
PT3 Revision II - A Tale of three intersecting lines
5.
Find the exterior angle at a vertex
Question:
3
m.
The exterior angles at the vertices \(A\) and \(B\) are \(122^{\circ}\) and \(148^{\circ}\) respectively. Find the angle at vertex \(C\).
Answer:
Angle
Property used
\(\angle a\) \(=\)
\(^{\circ}\)
Sum of all the angles in a triangle is 180°.
The sum of the linear pair of angles is 180°.
The exterior angle of a triangle is equal to the sum of the interior opposite angles
\(\angle b\) \(=\)
\(^{\circ}\)
Sum of all the angles in a triangle is 180°.
The sum of the linear pair of angles is 180°.
The exterior angle of a triangle is equal to the sum of the interior opposite angles
\(\angle z =\)
\(^{\circ}\)
Sum of all the angles in a triangle is 180°.
The sum of the linear pair of angles is 180°.
The exterior angle of a triangle is equal to the sum of the interior opposite angles
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