Question

1. Calculati aria dreptunghiului ABCD, stiind ca AC=16 cm si sin(∡ADB)=$\frac{3}{4}$

Answer 1

AC=DB=16
sin(∡ADB)=3/4
AB/DB=3/4
AB/16=3/4
AB=12
AD=√(16²-12²)=√(256-144)=112=4√7
A=12×4√7=48√7 cm²