# 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.

(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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