Triangle and Its Elements

Q.

A triangle with all the three angles less than 60 degree is possible.

1. True

2. False

Q.

A polygon with 3 sides is called a _________

Q.

What is the maximum possible number of obtuse angles in a triangle? Justify your answer. [3 MARKS]

Q.

A triangle with following angles is possible :-

1. True

2. False

3. 2 right angles and an acute angle
4. 1 obtuse angle and 2 acute angles

Q.

Is a triangle a polygon ? Give reasons.

Q.

Do all triangles equal $180$ degrees?

Q. A triangle is always an open figure.

1. True
2. False

Q.

Which of the following can be the possible angles of a triangle?

${60}^{°}$, ${30}^{°}$, and ${70}^{°}$

Q.

The six elements of a triangle are its ‘a’ sides and ‘b’ angles. Find the value of $a\times b$.

___

Q.

Can a triangle have all angles less than ${60}^0$? Give reason for your answer.

Q.

A triangle with two obtuse angles is possible.

1. True

2. False

Q. If ${56}^{\circ }$ and ${85}^{\circ }$ are the two interior angles of a triangle, then the third angle is ______.

1. ${79}^{\circ }$
   
2. ${29}^{\circ }$
   
3. ${39}^{\circ }$
   
4. ${49}^{\circ }$
   

Q.

A triangle with two right angles is possible.

1. True

2. False

Q.

A triangle with two right angles is possible.

1. True

2. False

Q. The six elements of a triangle are its ‘a’ sides and ‘b’ angles. Then the value of $a\times b$ is .

1. 3
2. 6
3. 9

Q.

Two angles are complementary if their sum is equal to _______degrees .

1. 90

2. 120

3. 180

4. 45

Q. Which side will be present between the vertices A and B of a triangle ABC?

1. BC
2. AC
3. AB
4. none of these

Q. A closed figure which has three sides is called a .

1. triangle
2. quadrilateral
3. pentagon

Q.

The number of line segments required to construct a triangle is

1. 2

2. 3

3. 4

4. 5

Q.

The point of intersection of angle bisectors is called the ______.

1. circumcentre

2. orthocentre

3. centroid

4. incentre