Introduction to Construction of Triangles

Q. Two angles of a triangle are ${65}^{\circ }$ and ${45}^{\circ }$, then the third angle (in degrees) is ______ .

1. 70

Q. Sum of the interior angles of a triangle (in degrees) is ______ .

1. 180

Q.

Which one of the following angles can not be constructed using compass and ruler?

1. ${30}^{\circ }$
2. ${15}^{\circ }$
3. ${25}^{\circ }$
4. ${45}^{\circ }$

Q.

In ΔRST, RS=7 cm, ∠SRT=45°, and ∠RST=45°.
Which criterion can be used to construct ΔRST?

1. SAS

2. AAS

3. ASA

4. SSS