Chapter 8 · Class 9 ICSE · Free Worksheet PDF

Triangle Sums for Class 9 — Free ICSE Worksheet PDF with Answers

Download a free printable triangles worksheet for Class 9 ICSE with 30 practice questions covering types of triangles, properties, congruence, similarity, Pythagoras theorem, and area of triangles. Includes complete answer key. ICSE-aligned for the 2025-26 syllabus.

Last updated: 5 May 2026

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30 questions (Easy + Medium + Hard) with answer key. Fresh set generated daily.

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Sample Triangles Sums for Class 9 — Practice Questions

Here are 8 sample triangles sums from this Class 9 ICSE worksheet. Download the full PDF for all 30 questions with answers.

Q1.What is the sum of all interior angles of a triangle?
A.90°
B.180°
C.270°
D.360°

Difficulty: Easy

Q2.In a triangle, two angles measure 65° and 45°. What is the third angle?
A.60°
B.70°
C.80°
D.75°

Difficulty: Easy

Q3.A triangle with all three sides equal is called:
A.Isosceles triangle
B.Scalene triangle
C.Equilateral triangle
D.Right triangle

Difficulty: Easy

Q4.What is each angle of an equilateral triangle?
A.45°
B.60°
C.90°
D.120°

Difficulty: Easy

Q5.A triangle with one angle equal to 90° is called:
A.Acute triangle
B.Obtuse triangle
C.Right triangle
D.Equilateral triangle

Difficulty: Easy

Q6.In a right triangle, if one acute angle is 35°, what is the other acute angle?
A.45°
B.55°
C.65°
D.75°

Difficulty: Easy

Q7.An isosceles triangle has how many equal sides?
A.0
B.1
C.2
D.3

Difficulty: Easy

Q8.The exterior angle of a triangle is equal to:
A.The sum of all three interior angles
B.The sum of the two non-adjacent interior angles
C.The adjacent interior angle
D.Half the sum of all angles

Difficulty: Easy

Answer Key — Sample Questions+
Q1:180°
Q2:70°
Q3:Equilateral triangle
Q4:60°
Q5:Right triangle
Q6:55°
Q7:2
Q8:The sum of the two non-adjacent interior angles

Download the full PDF for all 30 answers with step-by-step solutions.

About This Worksheet

TopicTriangles
BoardICSE
Class9
Total Questions30 (10 Easy + 10 Medium + 10 Hard)
Answer KeyIncluded
PriceFree

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Frequently Asked Questions

Where can I download free triangles sums for Class 9?+
You can download a free Triangles PDF worksheet for Class 9 ICSE right here on SparkEd. The worksheet includes 30 practice questions (types of triangles, properties, congruence, similarity, Pythagoras theorem, and area of triangles) at easy, medium, and hard levels with a complete answer key.
How many triangles questions are in this Class 9 worksheet?+
This SparkEd worksheet for Triangles Class 9 contains 30 questions — 10 easy, 10 medium, and 10 hard. The questions cover types of triangles, properties, congruence, similarity, Pythagoras theorem, and area of triangles. A fresh set is generated daily so students never repeat the same sheet.
Does the Triangles worksheet for Class 9 include answers?+
Yes! Every SparkEd worksheet comes with a complete answer key. Students can self-check their work after completing the sheet. The PDF is free to download and print.
Is this triangles worksheet aligned to ICSE syllabus?+
Yes. This worksheet is specifically designed for Class 9 ICSE students and aligned to the 2025-26 ICSE syllabus. All questions follow the ICSE exam pattern and difficulty level.
Can I print this Triangles worksheet?+
Absolutely! The worksheet downloads as an A4-size PDF that is ready to print. It includes the questions, space for working, and a separate answer key — perfect for classroom use or home practice.
How is this worksheet different from NCERT textbook exercises?+
SparkEd worksheets go beyond NCERT exercises by providing 30 questions at 3 progressive difficulty levels. Level 1 (Easy) builds confidence, Level 2 (Medium) tests application, and Level 3 (Hard) prepares for exams. Each worksheet includes word problems and conceptual questions, not just computation.

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