Question

20. Aflati aria unui triunghi dreptunghic, care are ipotenuza de 85 cm si o cateta de 77 cm.

Answer 1

$a^2+b^2=c^2$
$77^2+b^2=85^2$
$5929+b^2=7225$
$b^2=1296$
$b=\sqrt{1296}=36~cm$
$A=\frac{a\cdot b}{2}=\frac{77\cdot 36}{2}=77\cdot 18=1386~cm^2$