Advertisements
Advertisements
प्रश्न
The diameter of a semi-circular protractor is 21 cm. Its perimeter is ______.
विकल्प
36 cm
54 cm
72 cm
108 cm
MCQ
रिक्त स्थान भरें
Advertisements
उत्तर
The diameter of a semi-circular protractor is 21 cm. Its perimeter is 54 cm.
Explanation:
Perimeter of a semicircle
= Curved arc + Diameter
= `1/2 xx π xx d + d`
With d = 21 cm and `π = 22/7`
Arc = `(22/7 × 21)/2`
= 33 cm
So, perimeter
= 33 + 21
= 54 cm
shaalaa.com
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
