Question

1) calcule a área desse polígono :

a) verifique a figura primeiro ​

Answer 1

$\large\boxed{\begin{array}{l}\underline{\rm c\acute alculo~da~\acute area~do~ret\hat angulo\:}\\\sf A_{ret\hat angulo}=3,5\cdot7,5=26,25~cm^2\\\underline{\rm c\acute alculo~da~altura~do~tri\hat angulo\:} \\\sf h=10-7,5=2,5~cm.\\\underline{\rm c\acute alculo~da~\acute area~do~tri\hat angulo\:} \\\sf A_{tri\hat angulo}=\dfrac{1}{2}\cdot3,5\cdot2,5\approx 4,37~cm^2\\\sf A_{figura} =A_{ret\hat angulo}+A_{tri\hat angulo} \\\sf A_{figura}=26,25+4,37=30,62~cm^2.\\\rm reveja~o~gabarito\end{array}}$