Mathematics for IGCSE & O level - Mensuration (Section 10 - No. 1)
Which is the most accurate way to find the area of an irregular shape?
Use a ruler to measure each side.
Approximate the shape to a known geometric shape.
Draw a grid and count the squares within the shape.
Use a calculator.
Forklaring
Drawing a grid and counting squares provides the most accurate means to finding an irregular shape.