Angle Sum Property of a Triangle

Q.

Write the sum of angles of an acute triangle.

Q. Which of the following is true about the figure?

1. AO is the vertex of angle AOB
2. O is the vertex of the angle AOB.
3. O is the arm of the angle AOB
4. OB is the vertex of the angle AOB

Q. Mayor Modulus needs to build a right triangle shaped playground. Which of the following sets of interior angles can form a triangle?

$A.{45}^{\circ },{35}^{\circ },{90}^{\circ }$
$B.{60}^{\circ },{60}^{\circ },{60}^{\circ }$
$C.{70}^{\circ },{90}^{\circ },{20}^{\circ }$

1. A
2. B
3. C

Q. The model is shaded to show _______.

Q. The sum of the three interior angles of a triangle is:

1. 90°
2. 60°
3. 360°
4. 180°

Q. According to the angle sum property of a triangle, the sum of the _____ of a triangle is 180°.

1. three exterior angles
2. three interior angles
3. two interior angles and an exterior angle
4. two exterior angles and an interior angle

Q. Angle greater than ${90}^{\circ }$ is known as obtuse angle.

1. True
2. False