### Theory:

Let us learn how to construct a triangle if $$3$$ sides are known. To construct a triangle, first we shall draw a rough diagram which gives an idea where the sides would be. Let us consider an example.
Example:
Construct a triangle $$PQR$$ whose sides are $$PQ = 3 \ cm$$, $$QR = 8 \ cm$$ and $$PR = 6 \ cm$$.

Solution:

Step 1: First, we shall draw the rough figure of the triangle $$PQR$$ with the given measure.

Step 2: Draw a line segment $$QR$$ of length $$8 \ cm$$.

Step 3: With $$Q$$ as centre, draw an arc of radius $$3 \ cm$$.

Step 4: Similarly, with $$R$$ as centre, draw an arc of radius $$6 \ cm$$ which cuts the previous arc at $$P$$.

Step 5: Join $$PQ$$ and $$PR$$.

Therefore, $$PQR$$ is the required triangle.