iii) If the length of radius of a semi circular plate is 10.5cm, then the perimeter of the semi circular plate is. a)2π×10.5cm. b) (π+2)10.5cm. c) 2(π+1)×10.5cm. d) (π+1)×10.5cm. what is the correct answer of this MCQ?
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Answered by
59
Answer:
Circumference of a circle =2πr
Circumference of a circle =2πrCircumference of semi circle =
Circumference of a circle =2πrCircumference of semi circle = 2πr/2 =πr
∴ The length of curved line is πr
∴ The length of curved line is πrThe length of straight line(diameter)=2r
∴ The length of curved line is πrThe length of straight line(diameter)=2rThe total perimeter of a semi circle is πr+2r=r(π+2)
Answered by
11
Radius (r) = 10.5 cm
Perimeter of semicircular plate = πr + 2r
= (π + 2) r
= ( π + 2 ) 10.5
Hence, option b) (π+2)10.5cm, is correct.
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