[tex]h=\sqrt{2,5^2-(\frac{3}{2})^2}\\ h=\sqrt{6,25-2,25}\\ h=\sqrt{4}\\ h=2cm\\\\ P=\frac{2*3}{2}=3cm^2[/tex]
a = 3cm
b = 2,5cm
(1/2a)² + h² = b²
1,5² + h² = 2,5²
h² = 6,25 - 2,25
h² = 4
h = 2cm
P = 1/2 * a * h
P = 1/2 * 3 * 2
P = 3cm² -------- odpowiedź