Answer :

Step 1:

Draw a Ray BX and with B as center and radius 4.8cm cut an arc on the line and name it as C.

Step 2:

With B as center and 3.6cm as radius draw an arc.

Step 3:

With C as center and 3cm as radius cut the previous arc at A.

Step 4:

Join AB and AC.

Our Triangle is constructed.

Now we know that the angle opposite to the smallest side is the smallest angle in a triangle.

So ∠ABC is the smallest.

Now bisecting the ∠ABC

Step 5:

With B as center draw an arc that cuts AB and BC at P and Q respectively.

Step 6:

With P as center and radius more than PQ draw an arc then with Q as center and equal radius draw another arc that cuts the previous arc at Z.

Step 7:

Join BZ.

Now by cosine rule we get to know that ∠ABC=40°

So, ∠ABY=∠YBC=20°.

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