Discuss: Is student 1 correct? How do you know? “The missing lengths

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Presentation transcript:

Discuss: Is student 1 correct? How do you know? “The missing lengths are 3cm each”

What is the perimeter? Mini Whiteboards. Acknowledgements: https://donsteward.blogspot.com/search/label/perimeter

Establish that the perimeter is 32cm Mini Whiteboards.

Perimeter Expressions Charlie took a sheet of paper and cut it in half. Then he cut one of those pieces in half, and he repeated this until he had five pieces all together. He labelled the sides of the smaller rectangle, a for the shorter side and b for the longer side. Need pieces of A4 paper and scissors…

Perimeter Expressions Cut along the lines on your sheet. Keep every section How can we compare the lengths of the pieces? Does that help you find the dimensions of the other rectangles?

Perimeter Expressions Here is a shape that Charlie made by combining the largest and the smallest rectangles. What would the perimeter be? 10a + 4b

Perimeter Expressions Alison combined her rectangles in a different way. She got the perimeter 8a + 6b What could her combination look like?

Perimeter Expressions Charlie and Alison made sure that their rectangles always met along an edge, with corners touching. Combining the smallest and largest rectangles, what perimeters can you create?

Perimeter Expressions Using two or more rectangles, create some other combinations in this same way. They must be placed edge to edge.

Perimeter Expressions Partner A: Make your own combination but DON’T SHOW YOUR PARTNER. Tell your partner the perimeter. Partner B: Your mission is to find the combination that your partner has created. If you come up with a new combination with the same perimeter - what is the same and what is different?

Perimeter Expressions What is the largest perimeter you can make? Why is this the largest perimeter? Can you make two different shapes with the same perimeter? Can you make a shape with the perimeter 7a + 4b?

Perimeter Expressions d c What would happen if we name the sides of a different rectangle? Lets name the larges t rectangle sides c and d … What would the perimeter of the other rectangles be? (Only using the letters c and d)

What is the perimeter? Checking for understanding, on whiteboards: https://donsteward.blogspot.com/2012/02/l-shaped-perimters.html

What is the perimeter? https://donsteward.blogspot.com/2012/02/l-shaped-perimters.html

What is the perimeter? https://donsteward.blogspot.com/2012/02/l-shaped-perimters.html

What is the perimeter? https://donsteward.blogspot.com/2012/02/l-shaped-perimters.html

What is the perimeter? https://donsteward.blogspot.com/2012/02/l-shaped-perimters.html

Title: Algebraic Perimeters In your book: Title: Algebraic Perimeters Find the perimeter of each shape. Simplify your answers as much as you can.

Mark your work: 6x – 4 10e + 10 18p – 6 4c + 12 12g – 8 12r 6s – 2 4t – 2

More practise:

Mark your work: 10x + 6xy – 4 10h2 + 10h 16m2 – 4m 12g – 8 5a2 + 4a – 3 8b2 + 12b – 4 10t2 + 17t – 7 20a + 12