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Boxes

Boxes. On 1 cm square paper, draw this net. Cut it out. Work out the perimeter of the net in centimetres. Perimeter =. 3 +. 2 +. 2 +. 2 +. 2 +. 2 +. 3 +. 2 +. 2 +. 2 +. 2 +. 2 =. 26 cm. What is the area of the net in square centimetres ?. area = 6 + 6. + 4 + 4.

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Boxes

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  1. Boxes

  2. On 1 cm square paper, draw this net. Cut it out

  3. Work out the perimeter of the net in centimetres.

  4. Perimeter = 3 + 2 + 2 + 2 + 2 + 2 + 3 + 2 + 2 + 2 + 2 + 2 = 26 cm

  5. What is the area of the net in square centimetres ?

  6. area = 6 + 6 + 4 + 4 + 6 = 26 cm2 cm2 means square centimetres

  7. Fold your net to make an open box. Tape it together. How many 1 cm cubes do you think will fit into the box?

  8. 12 cubes fit into the box. The box has a volume of 12 cubic centimetres

  9. Look at this box 8 cm 3 cm 6 cm What is the volume of the box? What would be the area of a net used to make it?

  10. volume = l x w x h = 8 x 6 x 3 = 144 cm3 8 cm 3 cm 6 cm area of net = 2wh + 2l h + l w = 2 (8 x 3) + 2(3 x 6) + (6 x 8) = 132 cm2

  11. Copy this net onto 1 cm squared paper

  12. Find its perimeter Find its area Make the solid, find its volume End

  13. Perimeter = 38 cm 5cm 3cm 5cm 3cm 3cm 3cm 3cm 5cm 3cm 5cm

  14. bh 2 Area of = =6 cm2 3cm 6 cm2 5cm 3cm 4cm 3cm 15 cm2 9 cm2 3cm 12 cm2 6 cm2 Total area = 48 cm2

  15. Volume of a prism = cross section area x length 3cm Area of cross section bh 2 = = 6 cm2 4cm 3cm Volume of a prism = cross section area x length Volume of the prism = 6 x 3 = 1 8 cm3

  16. End

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