Anyone good at maths help me figure this out??

[happytobemrsg]

Need to find out whether my iPhone 8 Plus will fit in this round bag. If it was rectangular I could figure it out myself, but being round it’s just going straight over my head.

iPhone 8 Plus dimensions:
Height: 6.24 inches (158.4 mm) Width: 3.07 inches (78.1 mm) Depth: 0.30 inch (7.5 mm)

Bag dimensions:
H20.5cm x W20.5cm x D5.5cm

Link to bag:
www.tedbaker.com/uk/Womens/Accessories/Bags/ACANTHA-Leather-circle-cross-body-bag-Brown/p/159499-BROWN.

Thanks so much!

It should do - the bag is nearly 5cm taller than the phone, I'd be surprised if the curvature was such that the phone would be too tall. However, depends a little on thickness of the material (as those are presumably external dimensions).

Get a compass and draw it on a piece of paper (I'm sure there's a mathsy way of figuring it out, probably involving pi. But I've no idea what it is).

Yes.

Height
Phone: 15.84cm bag: 20.5cm

Width
Phone: 7.81cm bag: 20.5cm

Depth
Phone: 0.75cm bag: 5.5cm

Now that's an interesting question.

I think a diagram would be great. Draw the bag and then have draw the phone on a different bit of paper and see if it will fit in....

(this could end up on the Daily Mail with stumped Mumsnet users)

(this could end up on the Daily Mail with stumped Mumsnet users)

Nah, cos then they'd have to figure out the answer themselves and that's far too much like real work.

Excuse crude drawing but, depending on internal measurements, it should fit:

Yes unless the lining is much smaller than the outer bag

Draw the bag and then have draw the phone on a different bit of paper and see if it will fit in.

Or draw the bag and set the actual phone on it to see if it fits.

Or draw the bag and set the actual phone on it to see if it fits

That would probably work as well!!

Should do.
I expect the dimensions are external rather than internal so you need to allow a little.

I'm now getting Ted Baker adverts on the side bar.

Hmm,tricky as you have the bag's external rather than internal dimensions. But using a circle chord calculator like www.handymath.com/cgi-bin/arc18.cgi gives the segment height as 7.7mm which is what you're losing from the width because the bag is curved. So you'd need the internal dimensions to be the length of the phone plus 7.7mm each end, which is about 175mm, allowing for seams of about 15mm either end. So possible but fairly tight!

Yes I think so because the longest part of the phone from its centre is the hypotenuse it makes diagonally from the centre to its outer corner. I calculate this to be 8.81cm.

If this is smaller than the radius of the circle of the bag then it will fit. And as the radius is 10.25cm then you have 1.44cm wiggle room which should allow for any cushioning.

Also thank you for such a beautiful question. It has really cheered me up.

Try baking your phone in a 20.5cm diameter pie. You will have your answer.

@Messyisthenewtidy that's impressive love how the question cheered you up

Thank you for going to so much trouble @FadedRed, @Messyisthenewtidy & @UnaOfStormhold, I knew MN wouldn’t let me down! It does look a bit tight but doable.

I’m going to have to order the bag just to update you lovely Mumsnetters aren’t I?? I’ll be sure to report back.

It should be even less tight than you expect, because you can also take into account the 5.5 depth of the bag, and fit the phone in on an angle if needed; the calculations above are measuring whether it would fit flat in a 2-dimensional circle. Adding the 3rd dimension gives a bit more space. You can do some nice 3-d pythagoras if you really want to know how much space.