10th Class
Mathematics
Areas Related to Circles
Question Bank
Case Based MCQs - Areas Related to Circles
question_answer
Refer to Design B
The circumference of outer part (golden) is
A)48.49mm
B)82.2mm
C)72.50mm
D)62.86mm
Correct Answer:
D
Solution :
Directions (iii-iv) We have, circumference of silver part = 44 mm \[\therefore \,\,\,2\pi r=44\] \[\Rightarrow \,\,\,\,r=\frac{44}{2\times \frac{22}{7}}=7\,\,mm\] \[\therefore \,\,\,\,R=r+3=7+3=10\,\,mm\] Circumference of golden part \[=2\pi R\] \[=2\times \frac{22}{7}\times 10\] = 62.86 mm