Anyways, you know how there's like a plane of symmetry through the dimensions because of the identical faces opposite of each other? We talked about that for a bit. There's the pair of faces with height and length (hl). There's height and width (hw) and there's also length and width (lw).
(That's really hard to see but the first one shows height and length, the second shows height and width and the third shows length and width)
So that covers all the faces of the rectangular prism, right? Since there's 2 of each face, that makes the formula for the surface area of the rectangular prism:
2(hl)+2(hw)+2(lw)
We also got our tests back. Don't forget to get the parent signature.
After, we were asked to draw the net for a cylinder with a height of 6 and a circumference of 10 and cut it out without the circles on top which by the way is just a 6 by 10 rectangle since there are no circles. This is because the circumference is the length of the rectangle on the net (you know, if you unrolled the circle onto the length, it'd be the same).
So that was class. Here's the homework:
-Stick the nets in your journal and explain how to get the formula. I'm not sure if you're supposed to label them so can someone clarify that?
-Find the surface area of the cylinder with the height of 6 and circumference of 10
-How did you get the area of the circles on the top and bottom of the cylinder?
-Where is the symmetry on a cylinder and I think, how many planes of symmetry does a cylinder have?
-There's something on the grade 9 homepage to look at, I think.
-Journal
I pick Zerlina for the next scribe.
14 comments:
Great job Aleiah! I liked the way you explained what we did in class with such description. Your pictures are really well done and great use of colour!
Good job Aleiah! I think you covered pretty much everything in class. Nice picture,use of colours, and explanations. And thanks for listing homework that has to be done. Also, for the second last homework (gr. 9 homepage), we're suppose to make another post about the most elegant formulas for cylinders, cubes, and rectangular prisms. Good job again! :)
thanks for the scribe Aleiah and you did a great job explaining everything that we did today in class and thanks for listing the homework and for reminding that we had to get our test signed cause I almost forgot!:)
Great Job Aleiah. You went over everything in class, and made everything clear.Thanks for saying the homework i forgot to write it down.
GOOD JOB ALEIAH! I like your use of colour and how you explained everything. Thanks for writing down the homework! (:
Great job Aleiah! I like the picture it really makes sense and it is very understandable. I think you covered everything in class. I think that you should use darker colours but it you used the colours well. And you also made a few spelling mistakes, but overall you did great!
Great job on the scribe post Aleiah! I like the fact that you used colours, pictures, and put in what's for homework! Thaaanks~! (:
Heey Aleiah ! Good job. I really like how you explained it and I like how you use pictures to show us how to do it :) So, good job !!
Another great scribe guys, great job! You really explained everything we learned in class from the surface area of a rectangular prism to the surface area of a cylinder. Nice use of bold, and colours, maybe more pictures? But other then that great job! Guys take 2 minutes of your time, to comment!! It makes people really happy :) I wish this blog had an edit comment button instead of a delete..
Good job Aleiah! I liked how you used almost everything possible. The Bold and color really added to the post. Also, you explained everything really clearly and in an easy to understande way.
WOW!good job!you like explained everything we did it class.I like it how you coloured the important word so that it stands out!^^
Great job aleiah you explained everything properly and neatly. you also mentioned what's for home work, thanks for putting that in because i forgot to write it on my agenda.
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