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Ffion’s Pizzeria serves two sizes of circular pizza of the same thickness.

The small pizza has a diameter of 7 inches and costs £4.The large pizza has a diameter of 12 inches and costs £10.

(a) Calculate the area of the top of the large pizza. [2]

(b) By considering the area of the top of each pizza, decide which pizza is the better valuefor money. [4]

How do you work this one out guys? I haven't done maths for 3 years and don't have the resources/equipment. Resitting Maths for Uni entrance to get from D to C+

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Reply 1

Notnek

Original post by KyleH123

Starting with a), the question is basically saying : find the area of a circle with diameter 12 inches.

Do you know how to find the area of a circle?

Reply 2

KaylaB

Original post by KyleH123

First use the formula of Area = πr^2 where r= the radius of each pizza

Reply 3

KyleH123

Original post by notnek

Starting with a), the question is basically saying : find the area of a circle with diameter 12 inches.

Do you know how to find the area of a circle?

the perimeters times the amount of sides, wasn't it?

i've forgotten :frown:

Reply 4

Notnek

Original post by KyleH123

the perimeters times the amount of sides, wasn't it?

i've forgotten :frown:

You're getting a bit confused here. You don't normally use the word 'sides' when talking about a circle.

The area of a cricle can be found using this formula:

Area of a circle = pi x radius squared.

You have been given the diameter so first you need to find the radius.

Have another go and post your thoughts if you get stuck.

Reply 5

KyleH123

Original post by notnek

oh god i'm embarrassed. I'm ill, excuse me :frown:

Reply 6

KyleH123

Original post by notnek

C2π google told me this, could you explain this to meradius = diameter of circle divided by 2 pie?

i don't know how to work out the radius.

(edited 8 years ago)

Reply 7

Notnek

Original post by KyleH123

C2π google told me this, could you explain this to meradius = diameter of circle divided by 2 pie?

i don't know how to work out the radius.

Do you know what a diameter/radius are?

A diameter is twice the length of the radius. E.g. if the diameter was 6cm then the radius would be 3cm.

How are you learning GCSE? Do you have a textbook? Relying on Google is not the way to go.

Reply 8

KyleH123

Original post by notnek

No, past papers and online videos. I thought I'd remember more than I do.

Maybe I'll get a text book.

Reply 9

Notnek

Original post by KyleH123

No, past papers and online videos. I thought I'd remember more than I do.

Maybe I'll get a text book.

I assume you are going to be taking the foundation GCSE paper?

Area of a circle is a C level topic so don't be embarassed if you're finding it hard.

But I really recommend that you buy a textbook.

Reply 10

KyleH123

Original post by notnek

I assume you are going to be taking the foundation GCSE paper?

Area of a circle is a C level topic so don't be embarassed if you're finding it hard.

But I really recommend that you buy a textbook.

I haven't booked my exam yet, but I'm aiming to go for higher paper.

I still have plenty of time to catchup and I'm not very busy atm.

My mental maths is strong but I never was good at this sort of stuff.

Reply 11

Notnek

Original post by KyleH123

Can I ask why you are taking higher if you need a C?

Have you tried foundation past papers? You may find that it's easier to get a C in a foundation paper than in higher.

Reply 12

KyleH123

Original post by notnek

Can I ask why you are taking higher if you need a C?

Have you tried foundation past papers? You may find that it's easier to get a C in a foundation paper than in higher.

I thought I might as well, an A looks better than a C and I have a lot of free time.

Reply 13

xoharrypotter

Original post by notnek

Can I ask why you are taking higher if you need a C?

Have you tried foundation past papers? You may find that it's easier to get a C in a foundation paper than in higher.

in higher you only need around 30% for a C it's a lot lot easier to get a C with higher than foundation, many people i know who have very weak maths ability are put in for higher just because its a lot easier to get a C x

Reply 14

KyleH123

Original post by notnek

Can I ask why you are taking higher if you need a C?

Have you tried foundation past papers? You may find that it's easier to get a C in a foundation paper than in higher.

is the area 38.465?

diameter of 7 -- divided by 2 gives 3.5,

radius of 3.5 squared gives 12.25, 12.25 x 3.14 = 38.465

Area of a circle = pi x radius squared.

(edited 8 years ago)

Reply 15

KyleH123

Original post by KyleH123

is the area 38.465?

diameter of 7 -- divided by 2 gives 3.5,

radius of 3.5 squared gives 12.25, 12.25 x 3.14 = 38.465

Area of a circle = pi x radius squared.

is my answer correct? :c

Reply 16

Notnek

Original post by KyleH123

I thought I might as well, an A looks better than a C and I have a lot of free time.

Yes if you're willing to put the work in and learn the higher topics then the higher paper is the way to go.

Reply 17

KyleH123

Original post by notnek

Yes if you're willing to put the work in and learn the higher topics then the higher paper is the way to go.

Yeah, I really want to get a good grade. Did I get the answer right in the end?

Reply 18

Notnek

Original post by KyleH123

is the area 38.465?

diameter of 7 -- divided by 2 gives 3.5,

radius of 3.5 squared gives 12.25, 12.25 x 3.14 = 38.465

Area of a circle = pi x radius squared.

Yes that's correct.

For b) you need to first find the area of the small pizza and then work out which one is the best value for money.

Have a go at this and post your working if you get stuck.

I won't be able to help again tonight but hopefully someone else can. If not I can help tomorrow.