Draw an angle and label it as $$ \angle BAC.$$ Construct another angle, equal to $$ \angle BAC.$$
Steps of construction:
Step 1: Draw any angle $$BAC$$.
Now will construct an angle equal to $$∠BAC$$.
Step 2: Draw a line segment $$QR$$.
Step 3: Draw an arc that intersects $$∠BAC$$ at $$E$$ and $$D$$ using $$A$$ as a center and choose any radius.
Step 4: With the same measurements (as in step 3), Draw an arc from point $$Q$$.
Step 5: With $$S$$ as center and radius equal to $$DE$$, draw an arc which intersects the previous arc at $$T$$.
Step 6: Join $$Q$$ and $$T$$.
$$\angle PQR$$ is our new angle equal to $$\angle BAC$$