In grade 6 we tried to infer how to find the area of a parallelogram.
One group tried to divide the parallelogram into separate shapes (good thinking!) — a rectangular shape in the middle, and also 2 triangles on the sides. Steven figured out that the two triangles might be equal in side to the shape in the middle. But we weren't sure what the dimensions of the middle shape would be.
In our Reflect & Connect session, Ms Fawcett showed us that Carys and Katelyn were right — with a big cut-out paper parallelogram and movable triangualr end. Then she drew a diagram on the SMARTboard to show how the rectangle can be made. The parallelogram base becomes the base of the rectangle…..the parallelogram height is the same size as the height of the rectangle. (The tricky part is that the diagonal adjacent side is not used to calculate the area….but it might show up on a question to trick us. The adjacent side SHOULD be used though to calculate the perimeter.)
So we can make a formula for the Area of a Parallelogram:
In Grade 5 we took up work on calculating perimeter, and as always, show our work in more than one way for Level 4.
Then we got to work on figuring out the dimensions of a polygon when the Area is a given value and we don't know the dimensions (length and width).
Dodgeball! We have a new rule, though…students must aim for below the waist. Any hits above the waist will result in the the thrower being “out”, not the person that was hit.
We brought home some of our art today from Mr. O's class — water colours! Here are some examples.