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# Copy of Copy of Operation: STROKE A FURRY WALLLLL!!!!!

Made by: The M&M's

by

Tweet## Naomi Johnson

on 17 June 2011#### Transcript of Copy of Copy of Operation: STROKE A FURRY WALLLLL!!!!!

Operation: STROKE A FURRY WALL! 1 2 3 4 5 Our Problem Questions Our Ideas Our Working Out The Solution 1 We were given what we thought was an impossible task; to find the number of hairs on the human head. We decided to conduct our research on Ming's head; due to the short lengnth of his hair and his spherical head. To make matters worse we were not even allowed to utilise the internet. 2 To solve our problem we needed

to first work out the questions that

would aid us in our problem solving.

Here are our questions.

What is the radius of Ming's head?

How do you find the surface area of a sphere?

What is the percentage of hair that does not cover Ming's head?

How many hairs are in 1cm ? Main Topics 3 We had many ideas; here were

our 2 main ones.

Finding the weight of a single

hair then shaving someone's head

and dividing it by the weight of the single hair.

OR

By guessing that Ming's head was an approxiamate sphere we could find the surface area of his head by calculating the surface area of a sphere, then multiply the number of hairs in 1cm by the surface area of Ming's head covered by hair. 4 In detail, this is exactly how we calculated the number of hairs on the human head. 5 OUR QUESTIONS ANSWERED By using our simple method we were able to successfully calculate the number of hairs on the human head. By answering our questions we came up with the number 39201 hairs became the answer to our problem. 2 2 2 1. We found the surface area of Ming's head.

2. We found the amount of hairs in 1cm.

3. We then multiplied the number of hairs in each cm by the surface area of Ming's head covered by hair. Don't get how we found the surface area? Go to youtube and search 'how to find the surface area of a sphere'. To find the surface area of a sphere;4 Pi(3.14) x radius, in Ming's case the radius equals 85.38cm. Therefore the surface area is 1073cm. The radius of Ming's head is 9.24cm.

The percentage of Ming's head not covered by hair is approximately 50%.

There are approximately 73 hairs in 1cm. We each had an individual estimation of how many hairs were in 1cm. We then averaged out our answers to get the number of hairs in 1cm, which is equal to 73 hairs. This equation equals 73 x

half the surface area of Ming's head which is equal to 537cm. Basically this is 73 x 537. THE M&M's Here are videos and a photo of the people in the M&M's. Roshan Naomi Declan Jacob & Ming Lachlan Group Photos The End THE EHD naomi Roshan Rosie Declan Jacob Lachlan Mingxiao This Prezi was brought to you by

and Naomi Johnson Roshan Richardson 1. 2. 3. 2 2 2 2 2 2 2 milly THE MATHS SONG

Full transcriptto first work out the questions that

would aid us in our problem solving.

Here are our questions.

What is the radius of Ming's head?

How do you find the surface area of a sphere?

What is the percentage of hair that does not cover Ming's head?

How many hairs are in 1cm ? Main Topics 3 We had many ideas; here were

our 2 main ones.

Finding the weight of a single

hair then shaving someone's head

and dividing it by the weight of the single hair.

OR

By guessing that Ming's head was an approxiamate sphere we could find the surface area of his head by calculating the surface area of a sphere, then multiply the number of hairs in 1cm by the surface area of Ming's head covered by hair. 4 In detail, this is exactly how we calculated the number of hairs on the human head. 5 OUR QUESTIONS ANSWERED By using our simple method we were able to successfully calculate the number of hairs on the human head. By answering our questions we came up with the number 39201 hairs became the answer to our problem. 2 2 2 1. We found the surface area of Ming's head.

2. We found the amount of hairs in 1cm.

3. We then multiplied the number of hairs in each cm by the surface area of Ming's head covered by hair. Don't get how we found the surface area? Go to youtube and search 'how to find the surface area of a sphere'. To find the surface area of a sphere;4 Pi(3.14) x radius, in Ming's case the radius equals 85.38cm. Therefore the surface area is 1073cm. The radius of Ming's head is 9.24cm.

The percentage of Ming's head not covered by hair is approximately 50%.

There are approximately 73 hairs in 1cm. We each had an individual estimation of how many hairs were in 1cm. We then averaged out our answers to get the number of hairs in 1cm, which is equal to 73 hairs. This equation equals 73 x

half the surface area of Ming's head which is equal to 537cm. Basically this is 73 x 537. THE M&M's Here are videos and a photo of the people in the M&M's. Roshan Naomi Declan Jacob & Ming Lachlan Group Photos The End THE EHD naomi Roshan Rosie Declan Jacob Lachlan Mingxiao This Prezi was brought to you by

and Naomi Johnson Roshan Richardson 1. 2. 3. 2 2 2 2 2 2 2 milly THE MATHS SONG