Types of Triangles on the Basis of Angles

Q. Given that two angles of triangle A are ${50}^o\&{40}^o$ and two angles of triangle B are ${65}^o\&{20}^o$.
Which of the following is/are correct?

1. Triangle A is an acute angled triangle.
2. Trinagle B is an obtuse angled triangle.
3. Triangle A is a right-angled triangle.
4. Triangle B is a acute angled triangle.

Q.

Can a triangle have two obtuse angles? Give reason for your answer.

Q.

Name the type of triangle

$△PQR$ such that $PQ=QR=PR=6cm$

Q. What type of triangle is shown in the figure below ?

1. Right-angled triangle
2. Obtuse-angled triangle
3. Acute-angled triangle
4. None of the above.

Q. $△ABC$ is an acute angled triangle if $\angle A,\angle B\&\angle C$ are all less than ${90}^{\circ }$.

1. True
2. False

Q. Given image shows the boundary of MATH city. Given that one angle of the triangular shaped city is ${121}^o$. Which of the following type of triangle is the shape of MATH city.

1. Acute angled triangle
2. Obtuse angled triangle
3. Right angled triangle
4. None of the above.

Q. Which of the following is arranged as right-angled triangle, acute-angled triangle and obtuse-angled triangle respectively from left to right?

1. 
2. 
3. 
4. None

Q. Isosceles triangle have two sides that are of the same length.

1. No
2. Yes

Q. If $a,b\&c$ are the lengths of the sides of the triangle $ABC$, then match the following:

1. Scalene triangle
2. Isosceles triangle
3. Equilateral triangle

Q. Which of the following given triangles are right-angled triangles?

1. $A$ and $D$
2. $B$ and $C$
3. $A$, $B$, $C$ and $D$
4. None

Q. For the given side lengths of a triangle, match the following to the type of triangle.

1. Isosceles Right △
2. Isosceles △
3. Scalene Right △
4. Scalene △

Q. For any triangle $△MNO$, match it with the correct type of triangle.

1. An acute triangle
2. An obtuse triangle
3. A right triangle