Class 7MathematicsTriangles and Its Properties

Angle Sum Property of Triangle

Sum of all angles in any triangle = 180°. Always true regardless of triangle type. Proof: draw a line parallel to base through the vertex — alternate angles and corresponding angles show the three angles of triangle make a straight line (180°). If two angles are known, third = 180° − sum of known two.

How to study this topic

Read the core explanation once without solving.
Open the formula links below and connect them with the topic meaning.
Practice the 10 example pages one by one.
Use the AI ask page for text, voice or image-based doubts.

10 example pages

Concept check 1

For Class 7 Mathematics, explain or solve a angle sum property of triangle question from the chapter "Triangles and Its Properties". Focus on concept check and show the working clearly.

Definition to application 2

For Class 7 Mathematics, explain or solve a angle sum property of triangle question from the chapter "Triangles and Its Properties". Focus on definition to application and show the working clearly.

Formula warm-up 3

For Class 7 Mathematics, explain or solve a angle sum property of triangle question from the chapter "Triangles and Its Properties". Focus on formula warm-up and show the working clearly.

Reasoning practice 4

For Class 7 Mathematics, explain or solve a angle sum property of triangle question from the chapter "Triangles and Its Properties". Focus on reasoning practice and show the working clearly.

Board-style short answer 5

For Class 7 Mathematics, explain or solve a angle sum property of triangle question from the chapter "Triangles and Its Properties". Focus on board-style short answer and show the working clearly.

Mistake correction 6

For Class 7 Mathematics, explain or solve a angle sum property of triangle question from the chapter "Triangles and Its Properties". Focus on mistake correction and show the working clearly.

Visual interpretation 7

For Class 7 Mathematics, explain or solve a angle sum property of triangle question from the chapter "Triangles and Its Properties". Focus on visual interpretation and show the working clearly.

Applied word problem 8

For Class 7 Mathematics, explain or solve a angle sum property of triangle question from the chapter "Triangles and Its Properties". Focus on applied word problem and show the working clearly.

Revision challenge 9

For Class 7 Mathematics, explain or solve a angle sum property of triangle question from the chapter "Triangles and Its Properties". Focus on revision challenge and show the working clearly.

Exam recap 10

For Class 7 Mathematics, explain or solve a angle sum property of triangle question from the chapter "Triangles and Its Properties". Focus on exam recap and show the working clearly.