Step 3: With r as radius, draw arcs with B and C as centres. The point of intersection of the arcs is point D. $∠ D O A$ is__
Note: Answer in degrees.

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Solution

Statement: With r as radius, draw arcs with B and C as centre. The point of intersection of the arcs is point D.
$∠ D O A$ is $90^{\circ}$ .
Reason: When we take a fixed radius and draw two arcs by putting the compass pointer at both the arms forming an angle such that the arcs intersect each other, the point of intersection actually bisects that angle. So, $∠ D O A = ∠ A O B + ∠ B O D = 60^{\circ} + 30^{\circ} = 90^{\circ}$ .

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Step 3: With r as radius, draw arcs with B and C as centres. The point of intersection of the arcs is point D. ∠DOA is__ Note: Answer in degrees.

Step 3: With r as radius, draw arcs with B and C as centres. The point of intersection of the arcs is point D. $∠ D O A$ is__
Note: Answer in degrees.