Isosceles Triangle

Q.

A triangle whose two sides are of equal length is known as ___ triangle.

Q.

An equilateral triangle is also an isosceles triangle.

1. True

2. False

Q.

If there are exactly two sides equal in a triangle, it is known as ___ triangle.

Q. The base angles of a right angled isosceles triangle measures ___

1. ${30}^o$
2. ${45}^o$
3. ${90}^o$
4. ${50}^o$

Q. In a triangle ABC, AB = 4 cm, BC = 5 cm, and CA = 6 cm. What is the perimeter of the triangle?

1. 15 cm
2. 12 cm
3. 9 cm
4. 14 cm

Q. Consider the following figure and answer the below question

What type of triangle is ∆PQR?

1. Scalene triangle
2. Equilateral triangle
3. Isosceles triangle
4. Right angle triangle

Q.

Derive the angle sum property of the triangle using the exterior angle property of the triangle. [4 MARKS]

Q. Match the following triangles.

1. Scalene
2. Isosceles
3. Equilateral

Q.

What is isosceles triangle

Q.

A triangle is made up of different positions of a second hand in a clock as shown below. The triangle formed in the given figure is called?

1. Both B and C

2. Scalene triangle

3. Right angled triangle

4. Isosceles triangle

Q.

If there are two equal sides in a triangle, it is an isosceles triangle.

1. Isosceles triangle

2. Scalene triangle

Q. In a triangle ABC, AB = 4 cm, BC = 5 cm, and CA = 6 cm. What is the perimeter of the triangle?

1. 15 cm
2. 12 cm
3. 9 cm
4. 14 cm

Q.

In the given figure,

How many angles are present?

1. 2
2. 1
3. 3
4. 0

Q.

Name this triangle

1. Isosceles
2. Polygons
3. Congruent
4. Obtuse

Q.

In the below figure,

___ angles are present and they are ___ .

1. 3, ABC, DBC, DBA

2. 3, BDA, ABC, BCD

3. 3, CAB, BDA, BCD

4. 3, ACB, BDA, BCD

Q.

In the below figure, there are ___ angles and they are ___.

1. 3, ABC, DBC, DBA

2. 3, BDA, ABC, BCD

3. 3, CAB, BDA, BCD

4. 3, ACB, BDA, BCD

Q. How will you construct a ${150}^o$ angle?

Q.

In the below figure,

___ angles are present and they are ___

1. 3, ABC, DBC, DBA

2. 3, BDA, ABC, BCD

3. 3, CAB, BDA, BCD

4. 3, ACB, BDA, BCD

Q.

An angle in an isosceles triangle is ${80}^{\circ }$. Find the other two angles corresponding to equal sides.

1. ${40}^{\circ },{60}^{\circ }$

2. ${50}^{\circ },{50}^{\circ }$

3. ${30}^{\circ },{70}^{\circ }$

4. 80°, 20°.

Q. A triangle has two angles measuring 53${}^{\circ }$ and one angle measuring 74${}^{\circ }$. What type of triangle is this?

1. Isosceles
2. Right angled
3. Equilateral
4. Scalene

Q. In this figure QS and RS are bisectors of exterior angles Q and R. Then $\angle QSR+\angle P/2$ is equal to

1. ${270}^o$
2. ${180}^o$
3. ${90}^o$
4. ${60}^o$

Q.

Find the value of x in the given triangle?

1. $20°$
2. $25°$
3. $35°$
4. $30°$