Question

Find the area of shaded region
$AC=BD=7cm$
$AB=CD=1.75cm$

Answer 1

Area of shaded region$=[\frac{1}{2}\pi {\left(AC\right)}^2-\frac{1}{2}\pi {\left(AB\right)}^2]+[\frac{1}{2}\pi {\left(BD\right)}^2-\frac{1}{2}\pi {\left(CD\right)}^2]=\frac{\pi }{2}[7^2-{\left(1.75\right)}^2+7^2-{\left(1.75\right)}^2]=144.375{cm}^2$