[tex]a = \frac{a + b}{2} h[/tex]
[tex]\: \: \: = \frac{11cm + 5cm}{2}4cm[/tex]
[tex]\: \: \: = \frac{16cm}{2} 4cm[/tex]
[tex] \: \: \: = 8cm \times 4cm[/tex]
[tex]\: \: \: = 32cm^{2}[/tex]
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[tex]a = \frac{a + b}{2} h[/tex]
[tex]\: \: \: = \frac{11cm + 5cm}{2}4cm[/tex]
[tex]\: \: \: = \frac{16cm}{2} 4cm[/tex]
[tex] \: \: \: = 8cm \times 4cm[/tex]
[tex]\: \: \: = 32cm^{2}[/tex]
A = 32cm²