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Irregular shapes

Irregular shapes. perimeter. Objective. 0506.4.2 Decompose irregular shapes to find perimeter and area. Remember!!!. Perimeter all sides added together. Review of perimeter. http://www.jogtheweb.com/run/deYhohv5NJMJ/Area-and-Perimeter#1. Find the perimeter. 12 cm. P = 64 cm. 20 cm.

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Irregular shapes

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  1. Irregular shapes perimeter

  2. Objective • 0506.4.2 Decompose irregular shapes to find perimeter and area.

  3. Remember!!! • Perimeter • all sides added together

  4. Review of perimeter • http://www.jogtheweb.com/run/deYhohv5NJMJ/Area-and-Perimeter#1

  5. Find the perimeter 12 cm P = 64 cm 20 cm

  6. Find the perimeter P = 47 in 15 in 15 in 17 in

  7. What is an irregular shape?

  8. Try to make an irregular shape using the shapes you have… • How do you think you find the perimeter of your shape? Write down your answer.

  9. Perimeter of irregular shapes • You still add all the sides together to find the perimeter. • Try this one.

  10. Find the perimeter 6 cm 1 cm 1 cm P = 32 cm 2 cm 2 cm 4 cm 4 cm 2 cm 2 cm 1 cm 1 cm 6 cm

  11. Can you find the perimeter even when they don’t give you all the sides? 7 cm 2 cm 2 cm P = 44 cm 7 cm

  12. Using your shapes and a piece of paper: • Make 2 dimensional irregular shapes using the pieces you have in front of you. • Make at least 5 shapes. • Then using your ruler, find the perimeter using centimeters.

  13. Make one and trade • You are going to make one on a blank sheet of paper. • First, measure it so you know the perimeter. • Next, put the answer on the back, very small and light. • Then, we are going to walk around the room and work each others problems. • Finally, we will check answers.

  14. Homework • Worksheet irregular perimeter

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