a) P = a × b
a = 11 cm
b = 9cm
P = 11cm × 9cm = 99cm²
b) P = a× h
a = 8cm
h = 6cm
P= 8cm × 6cm = 48cm ²
c) P= [tex]\frac{(a+b) * h}{2}[/tex]
a = 5cm
b = 11cm
h = 7cm
P = [tex]\frac{(5+11) * 7}{2}[/tex] = [tex]\frac{16*7}{2}[/tex] = [tex]8 * 7 = 56cm^{2}[/tex]
d) P= [tex]\frac{1}{2} d_{1} d_{2}[/tex]
d₁ = 8cm
d ₂ = 12cm
P = [tex]\frac{1}{2}[/tex] * 8 * 12 = 4 * 12 = 48cm²
