Class exercise 3 – Area of irregular objects

Aim: To estimate area of irregular shapes

1) Place your left (or right) hand firmly on the piece of graph paper. Trace the outline of your palm and fingers onto the paper. Determine the approximate area covered by your hand.

Evernote Camera Roll 20130121 173103

Number of grids counted = 117

Area of each grid = 1 cm2

Approximate area of hand = 117 cm2

2) This is an estimation of the area of your and. Suggest how the accuracy of your estimation can be improved.

-> Use a smaller grid to estimate the area and keep my fingers closed when I trace the outline of my hand. This reduces the area of my hand left out of the measurement due to the grid not being ≥50% covered by the outline.

Evernote Camera Roll 20130121 173110

Number of grids counted = 302

Area of each grid = 0.36 cm2

Approximate area of hand = 108.72 cm2

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