Question

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 = 2tr, where r
is the radius of the circle.
(a)
(b)
(c)
2.8 cm
1.5 cm
2.8 cm-
2.8 cm
2 cm
2 cm-​

Answer 1

(a) Perimeter of figure =

2

2πr

+2r=r(π+2)=

2

2.8

(π+2)=7.19 cm

(b) Perimeter =1.5+1.5+2.8+π(

2

2.8

)=10.19

(c) Perimeter =π(

2

2.8

)+2+2=8.39

Clearly, for food

′

b

′

the ant has to go more...

hope it helps you