Tuesday, May 12, 2009

Scribepost for May 12

Today in Math class Mr. P wasn't here so Mr. Isfeld is teaching us. There was also an assembly about foot ball so we didn't do much.

But what we did do is study for our test tomorrow.

Here are some things to know to be ready for the test.

d=2r

This means diameter equals radius x 2.

This basically means that the diameter is twice the radius.

C=πd

This is the formula to find out the circumference. The formula stands for Circumference equals Pi times diameter

This means that the diameter times the Pi will give you a circumference.

The Pi is 3.14159265

But for the test, we will use the shortened version-3.14.

C=2πr

This is
basically the first two formulas combined. You multiply the radius by 2 and multiply it by π (3.14)

And we also got a study quiz.

This is what it looked like:

10
5

The middle "check" part is for you to check your answers later to see if you got the answers right.

You can also do this in home without the sheet.

I hope every passes the test.

Edit: I keep forgetting, I pick Brayden to do the next scribepost.

Thursday, May 7, 2009

Scribe post for May 7 2009

Today in math we did more things about circles.

Today we also got a new seating plan. Instead of our normal rows we were put in groups.

We started out with a warm up question. The question was how can u start from the centre and draw a circle without lifting your hand. While we were working on his we had a homework check for the problem of the week.

The answer to the question was start from the centre and fold the corner then start drawing over it. The once you start turning unfold the corner and finish the circle.

After we finished with the warm up question we checked our problem of the week. The problem of the week question was using the numbers 2/7, 4/7, 6/7, 8/7, 10/7, 12/7, 14/7, 16/7, and 18/7 only once, place them in the circles such that the sum on each side is 34/7.The answer was starting from the top going right: 4/7, 10/, 14/7, 6/7, 8/7, 18/7, 2/7, 16/7, 12/7, 4/7.

Note: This is not the only answer to the problem of the week.

After we finished checking our problem of the week we moved on to a group activity. The activity was everyone in your new seating plan were to measure a bunch of circles and put down their findings on a chart that was with their math notes.

After some time working on this activity we reviewed our answers. After that we had some notes.

We have discovered that the circumference or perimeter of a circle is approximately 3 times its diameter. Therefore we can use 3 x d when estimating circumference

We have also discoverd that the ratio of the circumference to diameter is approxemetly 3.14. We can use this value to calculate circumference. This value is repersented by a constant Pi which is often repessented by the greek symbol ---------------------------->

After we finished the notes we all handed in our homework which was to make a illusion with a circle that was at least 20 cm in diameter.

The next person I choose for the scribe post is Brendan.