Question

an ant is moving around a food pieces of semicircle shape how long ant has to move if diameter of semicircle is 1.4 cm​

Answer 1

Step-by-step explanation:

Answer:

(a) Radius = Diameter/2 = 2.8/2 = 1.4 cm

Circumference of semi circle = πr = 22/7 * 1.4

= 22 * 0.2 = 4.4 cm

Total distance covered by the ant = Circumference of semi circle + Diameter

= 4.4 + 2.8 = 7.2 cm

Class_8_Maths_Mensuration_DifferentShapes1

(b) Diameter of semi circle = 2.8 cm

Radius = Diameter/2 = 2.8/2 = 1.4 cm

Circumference of semi circle = πr = 22/7 * 1.4 = 22 * 0.2 = 4.4 cm

Total distance covered by the ant = 1.5 + 2.8 + 1.5 + 4.4 = 10.2 cm

Class_8_Maths_Mensuration_DifferentShapes2

(c) Diameter of semi circle = 2.8 cm

Radius = Diameter/2 = 2.8/2 = 1.4 cm

Circumference of semi circle = πr = 22/7 * 1.4 = 22 * 0.2 = 4.4 cm

Total distance covered by the ant = 2 + 2 + 4.4 = 8.4 cm

Hence for figure (b) food piece, the ant would take a longer round.

Total distance covered by ant is 8.4cm.

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