You can find multiple-choice questions (MCQs) with answers for Class 9 Maths Chapter 7 Triangles online. These questions follow the current exam format. Practicing these MCQs can help students prepare well for their exams. All questions are based on the CBSE (2024-2024) and NCERT guidelines. Each question comes with a clear explanation to help students grasp the concepts better. Explore chapter-specific MCQs at Infinity Learn (IL) and also review important questions for Class 9 Maths.
MCQs on Class 9 Maths Chapter 7 Triangles
Q. Which of the following is not a type of triangle based on sides?
A) Equilateral
B) Isosceles
C) Scalene
D) Right
Solution: D) Right
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Q. In an equilateral triangle, each angle measures:
A) 45°
B) 60°
C) 90°
D) 180°
Solution: B) 60°
Q. The sum of all angles of a triangle is:
A) 90°
B) 180°
C) 270°
D) 360°
Solution: B) 180°
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Q. In an isosceles triangle, the angles opposite to equal sides are:
A) Right angles
B) Acute angles
C) Obtuse angles
D) Equal angles
Solution: D) Equal angles
Q. Which theorem states that the sum of all angles of a triangle is 180°?
A) Pythagoras Theorem
B) Angle Sum Property
C) Isosceles Triangle Theorem
D) Midpoint Theorem
Solution: B) Angle Sum Property
Q. The side opposite to the right angle in a right-angled triangle is called:
A) Hypotenuse
B) Adjacent side
C) Opposite side
D) Base
Solution: A) Hypotenuse
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Q. Which of the following cannot be the angles of a triangle?
A) 30°, 60°, 90°
B) 50°, 60°, 70°
C) 40°, 50°, 100°
D) 45°, 45°, 90°
Solution: C) 40°, 50°, 100°
Q. The point where all medians of a triangle meet is called:
A) Orthocenter
B) Centroid
C) Incenter
D) Circumcenter
Solution: B) Centroid
Q. The ratio of the areas of two similar triangles is equal to the ratio of the squares of their corresponding:
A) Perimeters
B) Altitudes
C) Medians
D) Angles
Solution: B) Altitudes
Q. The ratio of the corresponding sides of two similar triangles is known as:
A) Congruence
B) Proportionality
C) Similarity
D) Perpendicularity
Solution: C) Similarity
Q. In a right-angled triangle, the side opposite to the angle of 30° is:
A) Hypotenuse
B) Base
C) Perpendicular
D) None of these
Solution: C) Perpendicular
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Q. The angles of a triangle are in the ratio 2:3:5. The largest angle is:
A) 30°
B) 40°
C) 50°
D) 60°
Solution: D) 60°
Q. Which of the following pairs of triangles is always similar?
A) Equilateral and Isosceles
B) Scalene and Equilateral
C) Equilateral and Scalene
D) Isosceles and Scalene
Solution: B) Scalene and Equilateral
Q. The bisectors of the angles of a triangle intersect at a point called:
A) Centroid
B) Incenter
C) Orthocenter
D) Circumcenter
Solution: B) Incenter
Q. If the sides of a triangle are in the ratio 3:4:5, then the triangle is:
A) Equilateral
B) Isosceles
C) Scalene
D) Right-angled
Solution: D) Right-angled
Q. The perimeter of an equilateral triangle with each side measuring 6 cm is:
A) 12 cm
B) 18 cm
C) 24 cm
D) 36 cm
Solution: B) 18 cm
Q. Which theorem is used to prove that two triangles are similar?
A) Pythagoras Theorem
B) Thales Theorem
C) AA Similarity Theorem
D) SAS Similarity Theorem
Solution: C) AA Similarity Theorem
Q. The ratio of the corresponding altitudes of two similar triangles is equal to the ratio of their:
A) Perimeters
B) Areas
C) Corresponding sides
D) Angles
Solution: C) Corresponding sides
Q. In an isosceles triangle, the angle opposite to the base is called:
A) Right angle
B) Acute angle
C) Obtuse angle
D) Vertex angle
Solution: D) Vertex angle
Q. The line segment joining the midpoints of two sides of a triangle is called:
A) Median
B) Perpendicular bisector
C) Altitude
D) Angle bisector
Solution: A) Median
