Q.5    An ant is moving around a few food pieces of different shapes scattered on the floor. For which food-piece would the ant have to take a longer round?

  Remember, circumference of a circle can be obtained by using the expression c = 2\pi r, where r is the radius of the circle.

                            

Answers (1)

(a) circumference 

= 2.8+\left ( \pi \times 1.4 \right )

=7.2 cm

(b)circumference

=1.5+2.8+1.5+\left ( \pi \times 1.4 \right )

=1.5+2.8+1.5+4.4

=10.2cm

(c) circumference

=2 +\left ( \pi \times 1.4 \right )+2

=4+4.4

=8.4

Hence, the perimeter of (b) is highest so ant have to take a longer round in (b).

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