# Measuring Irregular Areas with Graph Paper

TidyOpossum
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area

graph

outline

outline

graph

outline

17

outline

length

cm³

L

liquids

volume

milk

hold

capacity

## Study Notes

### Measuring Irregular Areas

• Area is the measure of the region inside a closed line.
• To find the area of an irregular shape, use a graph paper with parallel lines (thicker lines 1 cm apart, thinner lines 1 mm apart) to divide the paper into small squares (1 mm² each) and larger squares (1 cm² each).
• Count the number of squares inside the outline, counting only those with half or more of the square inside the outline.
• The total number of squares, multiplied by the area of each square, gives the area inside the outline.

### Measuring Volume

• The unit of volume is given by the cube of the unit of length (e.g., meter³, cm³, etc.).
• The litre (L) and millilitre (mL) are units of volume used to measure the volume of liquids.
• 1 m³ = 1,000,000 cm³, 1 L = 1000 cm³, and 1 mL = 1 cm³.
• Gallon and ounce are units of volume used in the UK and US, but they measure different volumes in the two countries (e.g., 1 US gallon = 3.78 L, 1 UK gallon = 4.54 L, etc.).
• A hollow body or container has an outer volume and an inner volume (capacity), measured in terms of the liquid it can hold.
• Containers with fixed capacities, such as conical measuring cans and metal cups, are used to measure the volume of liquids.

Learn how to measure the area of irregular shapes using graph paper. Explore the concept of dividing a region into small squares and calculating the total area by counting the squares. Understand the significance of using graph paper for determining areas of irregular shapes.

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