. In the given figure, a circle was folded and cut from its center. If the diameter of the circle is 7 cm, then the length of the boundary of the semi-c


In the given figure, a circle was folded and cut from its center. If the diameter of the circle is 7 cm, then the length of the boundary of the semi-circular disk so formed is

A  

(a) 7 cm

(b) 14 cm

(c) 15 cm

(d) 18 cm

 

Best Answer

Ans: (d)

Explanation:

Curved edge = ½ x circumference of the circle = ∏d/2=1/2*22/7=11cm

Therefore, total boundary of the semi-circular disk

= length of the curved edge + length of the straight edge (diameter)

= 11 cm + 7 cm = 18 cm

 

 

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