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Important Questions

Isosceles Triangles — Important Questions

ICSE · Class 9 · Mathematics

35 important questions from Isosceles Triangles for ICSE Class 9 Mathematics, with answers. Part of the ICSE Class 9 Mathematics syllabus.

35 questions20 flashcards8 formulas & key relations5 concepts

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A labeled diagram illustrating an isosceles triangle with two equal sides and the angles opposite to them also being equal. Includes the definition of an equilateral triangle as a special case.
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35 Questions·
multiple choicemultiple correcttext answertrue falsematchingordering

Important Questions from Isosceles Triangles

1multiple correct

Which of the following statements are true for an isosceles triangle? (Select all correct options)

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It has at least two equal sides, Angles opposite to equal sides are equal, The altitude from vertex angle bisects the base

An isosceles triangle has at least two equal sides (not necessarily all three). The fundamental property is that angles opposite to equal sides are equal. The altitude from the vertex angle to the base bisects the base at right angles. A triangle cannot have two right angles as the sum would exceed 180°.

2text answer

If the vertex angle of an isosceles triangle is 120°, find each base angle.

3true false

True or False: In an isosceles triangle, the altitude, median, and angle bisector from the vertex angle to the base are the same line.

Show answer

True

This is true for isosceles triangles. The altitude from the vertex angle to the base also serves as the median (bisects the base), angle bisector (bisects the vertex angle), and perpendicular bisector of the base. This is a unique property of isosceles triangles.

4text answer

In triangle XYZ, XY = XZ = 15 cm and ∠YXZ = 80°. Calculate the perimeter if YZ = 18 cm.

+31 more questions on Isosceles Triangles (ICSE Class 9 Mathematics)

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Frequently Asked Questions

What are the important topics in Isosceles Triangles for ICSE Class 9 Mathematics?
Key topics in Isosceles Triangles include Core ideas and definitions, Important theorem proofs, Other properties of isosceles triangles, Solved problem patterns to remember. Study these first, then practise questions on each for Class 9 exams.
How many important questions are there in Isosceles Triangles?
Super Tutor has 35 practice questions for Isosceles Triangles, including multiple choice, multiple correct, text answer, true false, matching, ordering questions. A sample with answers is on this page.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All ICSE Class 9 Mathematics Important Questions

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