# Pls help me with my maths

Watch
Announcements
#1
subject
Mathematics, 30.06.2019 04:00 Legrand4423
The sector AOB of a circle is shown. the length of its arc AB is 8pi cm. the sector is folded so that the straight edges meet and form a cone. calculate the radius of the base of the cone.
0
1 month ago
#2
(Original post by BoiNeedsSomeMilk)
subject
Mathematics, 30.06.2019 04:00 Legrand4423
The sector AOB of a circle is shown. the length of its arc AB is 8pi cm. the sector is folded so that the straight edges meet and form a cone. calculate the radius of the base of the cone.
0
1 month ago
#3
(Original post by BoiNeedsSomeMilk)
subject
Mathematics, 30.06.2019 04:00 Legrand4423
The sector AOB of a circle is shown. the length of its arc AB is 8pi cm. the sector is folded so that the straight edges meet and form a cone. calculate the radius of the base of the cone.
circumference of cone base = 8pi
circumference of a circle is measured by 2pi r
therefore the circumference of the circle formed by the base of the cone is worked out using 2 pi r, and therefore gave us 8 pi
thus we can form the equation:
8pi = 2 pi r
move 2 pi to the other side of equation
8 pi/2 pi = r
r is therefore equal to 4
r = 4cm
Hope this helped
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Have you experienced financial difficulties as a student due to Covid-19?

Yes, I have really struggled financially (74)
17.75%
I have experienced some financial difficulties (121)
29.02%
I haven't experienced any financial difficulties and things have stayed the same (157)
37.65%
I have had better financial opportunities as a result of the pandemic (52)
12.47%
3.12%