Question

Explain how to draw an obtuse angle using a protractor.

Answer 1

Hint: An obtuse angle is a type of angle which is always greater than ${90}^o$but less than${180}^o$. Obtuse angle lies between ${90}^o$and${180}^o$.

Complete step-by-step solution:
Let us take an angle greater than${90}^o$but less than${180}^o$i.e. ${150}^o$
Step-1: Draw a straight line or a line segment$AB$, which is one of the arms of the angle that is to be constructed.

Step-2: Point$A$represents the vertex of the angle.
Step-3: Place the centre of the protractor at $A$and along the arm$AB$.
Step-4: The protractor has two-way marking. We consider the scale which has $0$degrees near point $B$for construction.

Step-6: Mark point $C$ on the ray (CA) which is formed by constructing an angle of$150$degree.
 Step-7: Therefore, $\mathrm{\angle }CAB={150}^o$which is the required angle.

Note:When two rays meet at a point, they form an angle. The two rays are called the arms of the angle, and the point is called the vertex.