wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Raj cuts a disc with a radius of 7 cm into two equal parts. Calculate the entire perimeter.

A
32 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
35 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
36 cm
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
42 cm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 36 cm
When the circular disc is divided into two equal parts, we get two semi-circular discs.

Now, the perimeter of each semi-circular disc thus obtained is given by

12× Perimeter of the circle + Diameter

[Since diameter of the circle will also be a part of the semi-circular disc]

Perimeter of the semi-circle

=12×2πr+2r
=πr+2r=r(π+2)
=7×(227+2)
=36 cm

Therefore, perimeter of each semi-circular disc is 36 cm.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Circumference of a Circle
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon