Steps of construction:
Step 1: Draw a ray OA.
Step 2: With its initial point O as centre and any radius, draw an arc, cutting OA at C.
Step 3: With centre C and same radius (as in step 2). Draw an arc, cutting the arc of step 2 in D.
Step 4: With C and D as centres, and any convenient radius (more than CD), draw two arcs intersecting at B. join OB. Then ∠AOB = 30°
On measuring ∠AOB, with the protractor,
we find ∠ AOB = 30° .
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