human
Find the area of non-rectilinear shapes by counting squares, where all squares are either whole or exactly half-squares Each square is \( 1 \mathrm{~cm} \) by \( 1 \mathrm{~cm} \)

What is the area of this shape? ![A 6 by 5 centimetre squared grid. A purple right angled triangle is drawn on the grid with a base of 3cm and a perpendicular height of 3cm.]() \( 5 \mathrm{~cm}^{2} \)
gpt
Underestimates the area of shapes when counting squares when some squares are neither wholes nor halves