The shape is made up of rings of hexagons. The first ring has one hexagon, the second has six and the third has twelve. All hexagons are equal in size.

How many hexagons will be there in the ninth ring?

Question

The shape is made up of rings of hexagons. The first ring has one hexagon, the second has six and the third has twelve. All hexagons are equal in size.

How many hexagons will be there in the ninth ring?

anonymous · Answer

attachment

hero · Answer

Draw the fourth ring of hexagons. From there, you should be able to discover a pattern

anonymous · Answer

I'm only allowed to spend one minute per question is there a simpler method?

anonymous · Answer

It looks like a sequence type question.

anonymous · Answer

a simple geometric sequence

anonymous · Answer

is there a formula?

hero · Answer

yup. You should know it

anonymous · Answer

im not sure what it is?

hero · Answer

google it

anonymous · Answer

i never learnt the formula, because I'm still in primary

anonymous · Answer

is there a simpler method

hero · Answer

The formula is the simple method. Your teacher should have gone over these methods in class.

anonymous · Answer

the formula as far as I remember is x(n)=ar^n-1
where a = first term, r = common ratio(second term divided by first) and n = 1, 2, 3 (first term, second term etc)

anonymous · Answer

but that doesnt work here..so it must be simpler..

anonymous · Answer

so a =1
r = 1/6
n-1 =8

correct

anonymous · Answer

this is extra homework that igot

anonymous · Answer

yes, this is not fully geometric..therefore these formula wont work.

hero · Answer

Just draw the fourth ring mate

anonymous · Answer

you make a very good teacher Hero!!

anonymous · Answer

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