Question

Circular fountain has 18cm base blueprints scale 3cm to 4 feet what is actual area of base after built

Answer 1

$\bf \cfrac{\stackrel{model~cm}{3}}{\stackrel{actual~ft}{4}}\qquad \qquad \cfrac{\stackrel{model}{18}}{\stackrel{actual}{a}}=\cfrac{3}{4}\implies \cfrac{18\cdot 4}{3}=a$