1.3

Major VersionM

Introduction

A simple, effective and enjoyable way to measure the area of irregular shapes, such as leaves, by tracing out the shape and using graph paper.

1. Step 1 Precautions

• Wash hands after handling the leaves as it may contain dirt

2. Step 2 Step 1 – Tracing the outline of the leaf      • Lay the leaf on the graph sheet.

• Trace its outline using Pen/Pencil.

• No need to trace the area of Stem (Petiole).

3. Step 3 Step 2 – Marking the squares    • Use two different colors to mark full squares and partial ones

• Use Pen/Pencil and number the full squares inside the leaf trace.

• Use an alternative color to number the partial squares inside the leaf trace.

4. Step 4 Step 3 – Calculating the Surface area • Multiply the number of full squares by 1 cm2 and partial squares by 0.5 cm2 and add them together.

• Repeat the above steps for any number of leaves.

• Multiplying partial squares by 0.5 cm2 is not accurate. But, since the errors average out, you get a good estimate of the leaf's area.

5. Step 5 Optional Variation

• Try the same on 2 , 4 cm2 graph sheets and compare the results to arrive at the most accurate value.

6. Step 6 Troubleshooting

• Leaf is moved when profiling.

• Miscounted the number of "Full" and "Partial" squares.

• Margin of error when approximating the partial squares as 'Half'.

Finish Line

Author

Kailash NR

Member since: 05/02/2017

4,287 Reputation

92 Guides authored