To find the distance around a circular disc, multiply the diameter of the disc by 3.14. What is the distance around the disc when :

a) the diameter is 18.7 cm?

b) the radius is 6.45 cm?

A rule for finding the approximate length of diagonal of a square is to multiply the length of a side of the square by 1.414. Find the length of the diagonal when :

a) The length of a side of the square is 8.3 cm.

b) The length of a side of the square is exactly 7.875 cm.

The largest square that can be drawn in a circle has a side whose length is 0.707 times the diameter of the circle. By this rule, find the length of the side of such a square when the diameter of the circle is:

a) 14.35 cm

b) 8.63 cm

What is the cost of 27.5 m of cloth at 53.50 per metre?

In a hurdle race, Nidhi is over hurdle B andof the way through the race, as shown in Fig. 2.7.

Then, answer the following:

a) Where will Nidhi be, when she isof the way through the race?

b) Where will Nidhi be when she isof the way through the race?

c) Give two fractions to tell what part of the race Nidhi has finished when she is over hurdle C.