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Answers
(a)
Radius = Diameter/2 = 2.8/2 cm = 1.4 cm
Circumference of semi-circle = ∏.r = (22/7)×1.4 = 4.4
Circumference of semi-circle is 4.4 cm
Total distance covered by the ant = Circumference of semi – circle + Diameter
= 4.4 + 2.8
= 7.2 cm
Total distance covered by the ant = 7.2cm
(b)
Diameter of semi-circle = 2.8 cm
Radius = Diameter/2 = 2.8/2 = 1.4 cm
Circumference of semi-circle = r = (22/7) × 1.4 = 4.4 cm
Total distance covered by the ant= 1.5 + 2.8 + 1.5 + 4.4 = 10.2 cm
(c)
Diameter of semi-circle = 2.8 cm
Radius = Diameter/2 = 2.8/2 = 1.4 cm
Circumference of semi-circle = pi.r = (22/7) × 1.4 = 4.4 cm
Total distance covered by the ant = 2 + 2 + 4.4 = 8.4 cm
After analyzing results of three figures, we came to a conclusion that for figure (b) food piece, the ant would take a longer round