Construct the following angles using ruler and compass and verify by measuring them by a protractor.

30^o

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°

Verification:

On measuring ∠AOB, with the protractor,

we find ∠ AOB = 30° .