Question

$\text{The steps to draw two concentric circles of}$
$\text{given radius}\left(r_1\right)=6\text{cm and diameter}$
$\left(d_2\right)=20\text{cm are:}$

Step 1 : Mark a point 'O' as the centre.

Step 2 : Measure the distance between the pointer and the pencil as 6 cm for the first circle.

Step 3 : Place the pointer at 'O' and rotate the compass to trace the first circle.

Step 4 : ?

Step 5 : Again, place the pointer at 'O' and rotate the compass to trace the second circle.

Choose from the given options the missing step.

• A. Measure distance between pointer and the pencil as 10 cm for the second circle.
• B. Measure distance between pointer and the pencil as 20 cm for the second circle.
• C. Measure distance between pointer and the pencil as 12 cm for the second circle.
• D. Measure distance between pointer and the pencil as 8 cm for the second circle.

Answer 1

The correct option is A Measure distance between pointer and the pencil as 10 cm for the second circle.

The distance between the pointer of the compass and the pencil is the radius of that circle.

$\text{Diameter of second circle}\left(d_2\right)=20cm$
$\text{So, radius}\left(r_2\right)\text{will be}=\frac{20}{2}=10cm$

Hence,
Step 4 will be "Using ruler measure distance between the pointer and the pencil as 10 cm for the second circle."