Acute Angled Triangle

Q.

A triangle in which each angle is less than 90 degrees is called ___.

1. an acute-angled triangle

2. an obtuse-angled triangle

3. a right-angled triangle

4. a scalene triangle

Q.

How are triangles classified on the basis of their angles? Define each of them.

Q. The angles of a triangle measure ${40}^{\circ }$, ${110}^{\circ }$ and ${30}^{\circ }$. Such a triangle is called a/an _____.

1. obtuse angled triangle
2. acute angled triangle
3. isosceles triangle
4. right angled triangle

Q. Explain the three types of triangles based on their angles.

Q. The number of acute angles in a triangle is

1. Exactly $2$
2. At least $2$
3. Exactly $3$
4. At least $1$ and utmost $2$

Q. Classify the following triangles based on their sides and angles.

Q. Interior angles on the same side of a transversal with two distinct parallel lines are complementary angles.

1. True
2. False

Q. Equilateral triangle is an example of ________ .

1. acute angled triangle
2. obtuse angled triangle
3. right angled triangle
4. scalene triangle

Q. Lengths of two sides of a triangle are 12 cm and 15 cm. Then the length of the third side must be .

1. > 5 cm & < 27 cm
2. > 3 cm & < 27 cm
3. > 5 cm & < 12 cm

Q.

Observe the given figure and identify the type of triangle

1. Acute angled triangle

2. Obtuse angled triangle

3. Right triangle

4. Isosceles triangle

Q. The triangle given below is an acute-angled triangle.

1. True
2. False

Q.

A triangle in which each angle is less than 90 degrees is called ___.

1. an acute-angled triangle

2. an obtuse-angled triangle

3. a right-angled triangle

4. a scalene triangle

Q. State whether the following statements are true (T) or false (F):
Every isosceles triangle must be an equilateral triangle.

1. True
2. False

Q. Two angles of a triangle are ${30}^{\circ }\text{and}{60}^{\circ }.$ What kind of triangle it is based on its angles?

Q. Which of the following triangles is/are classified on the basis of angles?

1. Acute angled triangle
2. Scalene triangle
3. Equilateral triangle
4. Obtuse angled triangle

Q. The angles of a triangle are in AP and the greatest angle is double the least. Find all the angles.