The WHY behind the Area of a Circle

In Mathematics this week, we have continued our study of the measurement strand.

In particular:

Perimeter and area of a: square, rectangle, triangle and circle (circumference)

Volume of a: cube, rectangular prism, triangular prism, cylinder and cone

We have been learning Karate Maths to help us remember the formulas for each (ask your child to demonstrate!).  It is important however, that we understand the WHY for each... this is not so easy!

I have included a video below which helps to explain the WHY behind the area of a circle.  Check it out!    

Area of a Circle

Film Synopsis

Room 18 Synopsis - 'Strike Hospital'

This is it, it's time for the Strike Hospital to prove how good they are.  The District Health Board are threatening to shut them down.  Are they good enough to survive the week?  This hilarious slapstick comedy will make you wet your pants and cry with laughter. - Jonas 

Strike Hospital gets a warning from the Head of the District Health Board (Veronica English) and are put to the test when they only have one week to pick up their act.  Will they save the hospital in time?  A classic slapstick comedy that will have your eyes glued to the screen the whole time. - Jack B.

Room 18s slapstick comedy will make you laugh till you drop dead.  Strike Hospital is being closed down and the responsibility has been placed on the doctors' shoulders.  Will they save the hospital? - Ben M.

In a hospital where nobody can do anything right (e.g. people getting half-fros for no good reason) they challenge the District Health Board that there will not need to be any closing down involved.  Will they survive?  This slapstick comedy will make you giggle your guts out.  - Max

Strike Hospital is running out of business.  The staff are working their hardest.  The Head of the District Health Board deems a warning.  Can the staff save the hospital? - Kelley

A hospital under stress as they try to save their hospital.  They go through strategies, fights, danger and epic fails.  Can they help save Strike Hospital? - Michael

Strike Hospital is threatened by the irascible Veronica English.  She inundates the Hospital Board members minds with love.  Can the staff control themselves from her enchanting good looks.  Will they crash and burn?  - Oscar

Room 19 Synopsis - 'Footrot Flats - 'The Inspection'

Disaster is arriving this winter at the Footrots dootstep.  One inspection will decide it all!  Will they survive the wrath of the Murphy's?  It's up to Rangi, Pongo, Dog, Horse and Aunt Dolly to save the Footrots from the storm that's raging on? - Anu

The Footrots are back in their great old fashion, ready to challenge the wrath of the notorious EQC.  As they fight for their house they are pushed to the full limits.  So, get ready to indulge yourself in this dramatic new adventure. - Angus

The cover of Footrot Flats with Kiwi inspiration of the earthquake, Wal and Cooch's house needs rebuilding and the EQC men send a letter for them to come and inspect their house.  They came through the town, but the Murphy's have planned something very bad.  To find out more about this great movie, you'll have to come to our movie night on the 1st, 2nd and 3rd of July.  - Trinity

Khan Academy Measurement Videos

This is the final week of our measurement unit.  Watch the videos below in preparation for your post-test in Week 9, and remember to practise your Karate Maths. 

Circumference of a circle

Area of a circle

Volume and surface area of a cylinder

Volume of a cone

Volume of a sphere (for Bo)

Mathletics Results for Week 7

This week was TRIPLE or NOTHING.  Congratulations to:

Jonas - 1020 points - Bronze Certificate


Bo - 910 points
Lily - 666 points
Jake - 420 points
Josh - 370 points
Amelia - 160 points
Alice - 130 points
Jack - 90 points

Student Teacher from UC - Week 8 & 9

Earlier this week we met Tessa Pearce who is going to be on university placement with us for the next 2 weeks.  She will spend a further 4 weeks with us in Term 4.  She has written a wee introduction for parents and students:

Hi everyone!

My name is Tessa Pearce and I will be in Room 18 for the next couple of weeks as a student teacher from the University of Canterbury. 

Last year I graduated from Darfield High School and I have grown up in the Darfield area. My family own a sheep farm just out of Darfield and I always enjoy going home when I get a break from study. I am a keen Crusaders and All Blacks fan and I love sitting down to read a good book.

For this placement I am keen to be in a classroom and see it from a teacher’s perspective rather than a student. I am excited to see the short film that you have been working so hard on and listening to the last round of oral presentations.

I am really looking forward to getting to know you all and finding out about your interests.

Current Events Learning

Today we read about the 52 year old German man who is stuck in a cave.  We discussed some of the difficulties that rescuers may experience and the pros and cons of a rescue operation of this scale.  Parents, you may wish to discuss your opinions on this topic with your child.  Here are the videos links that we couldn't watch today:

http://www.bbc.com/news/world-europe-27793066

http://www.bbc.com/news/world-europe-27863643

Oral Language Reminder

Next week is our fourth and final round of oral language for Term 2.  So far, we have thoroughly enjoyed the creativity with which students have presented their speeches. 

Remember, the purpose is to both inform and entertain!  

For this round, students are to choose their own actor, actress, film director etc. to focus their speech on.  The criteria remains the same (each student has a copy of the rubric in their Portfolio).

I look forward to seeing what students bring next week.  Who has the WOW factor?