TRIANGLES - MCQs

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Maths — TRIANGLES

50 Questions Class 9 MCQs
1
Two figures are said to be congruent, if they have
2
Two triangles are congruent if their corresponding sides and angles are
3
Which of the following is a criterion for congruence of triangles?
4
The symbol for congruence is
5
If two sides and included angle of one triangle are equal to the corresponding parts of another, the triangles are congruent by
6
Which of these is not a criterion for congruence?
7
If all sides of one triangle are equal to all sides of another, then triangles are congruent by
8
In ?ABC and ?PQR, if AB = PQ, BC = QR and AC = PR, then
9
ASA stands for
10
RHS criterion applies to
11
Two right triangles are congruent if hypotenuse and one side are equal. This is called
12
The word “congruent” comes from
13
In ?ABC ? ?DEF, the vertex corresponding to A is
14
If two angles of one triangle are equal to two angles of another, then third angles are
15
If ?ABC ? ?PQR, then which of these is true?
16
If two sides of a triangle are equal, then
17
In an isosceles triangle, the equal sides are called
18
The line joining vertex to midpoint of opposite side is called
19
An altitude of a triangle is
20
In an isosceles triangle, the altitude from vertex bisects
21
In a scalene triangle
22
Equilateral triangle is also
23
The measure of each angle in an equilateral triangle is
24
The sum of angles in a triangle is
25
If two triangles are congruent, then their areas are
26
If ?ABC ? ?DEF, then ?A = ?
27
If two angles and one included side of one triangle are equal to corresponding parts of another, triangles are congruent by
28
Two triangles are congruent if their three sides are equal. This is
29
If two triangles are congruent, then their corresponding parts are
30
CPCT stands for
31
A triangle with sides 3 cm, 4 cm, and 5 cm is
32
The triangle with angles 50°, 60°, 70° is
33
If a triangle has two equal sides, it is called
34
If all angles of a triangle are equal, the triangle is
35
The perpendicular bisectors of sides of a triangle intersect at
36
The medians of a triangle meet at
37
The angle bisectors of a triangle intersect at
38
The altitudes of a triangle meet at
39
In an equilateral triangle, all centres coincide.
40
The perpendicular drawn from the vertex of an isosceles triangle bisects
41
Two triangles are said to be similar if their
42
The ratio of areas of two similar triangles is equal to
43
In a right triangle, if one acute angle is 30°, the other is
44
A triangle can be constructed if sum of any two sides is
45
If two sides of a triangle are unequal, the larger angle lies
46
The line segment joining midpoints of two sides of a triangle is
47
In ?ABC, D and E are midpoints of AB and AC, then DE = ?
48
Which theorem states “Angles opposite to equal sides are equal”?
49
In a triangle, the side opposite the smallest angle is
50
The sum of lengths of any two sides of a triangle is always
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Frequently Asked Questions

A triangle is a polygon with three sides, three vertices, and three angles.

Equilateral (all sides equal), Isosceles (two sides equal), Scalene (all sides different).

Acute (all angles < 90°), Right (one angle = 90°), Obtuse (one angle > 90°).

The sum of all interior angles of a triangle is always 180 degrees.

The exterior angle of a triangle equals the sum of the two opposite interior angles.

The sum of the lengths of any two sides of a triangle is greater than the length of the third side.

Triangles with equal corresponding sides and angles are congruent and can be superimposed on each other.

\(\text{SSS (Side-Side-Side),}\\ \text{SAS (Side-Angle-Side),}\\ \text{ASA (Angle-Side-Angle),}\\ \text{AAS (Angle-Angle-Side),}\\\small\text{RHS (Right angle-Hypotenuse-Side).}\)

Triangles with all three sides equal are congruent.

If two sides and the included angle are equal, the triangles are congruent.

If two angles and the included side are equal, the triangles are congruent.

For right triangles, if the hypotenuse and one side are equal, the triangles are congruent.

Area = (1/2) × base × height

By adding the lengths of all three sides. Perimeter = a + b + c

A line segment drawn from a vertex to the midpoint of the opposite side.

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