Question

Aria unui triunghi dreptunghic cu catetele 5respectiv 8 este=?

Answer 1

A = c1 x c2 : 2 = 8 x 5 : 2 = 40 : 2 = 20 cm²

Answer 2

$A = \dfrac{c_1 \times c_2}{2} \\ \\ A = \dfrac{5\ cm \times 8 \ cm}{2} \\ \\ A = \dfrac{40 \ cm^2}{2} \\ \\ \boxed{A = 20 \ cm^2}$