Question

3) Calcule a base de um retângulo de área igual a 75cm² e altura 5 cm.

Answer 1

$\large\boxed{\begin{array}{l}\sf A=\dfrac{b\cdot h} {2}\implies b=\dfrac{2A}{h}\\\sf b=\dfrac{2\cdot75}{5}\\\sf b=\dfrac{150}{5}\\\sf b=30~cm\end{array}}$