Question

un dreptunghi are diagonala de 13 m si latimea de 5 m cu cat este egala aria. rpd va rog

Answer 1

D = 13 m ; l = 5 m

D² = L²+l² => L² = D²-l² = 13² - 5² = 169-25 = 144 => L = √144 = 12 m

A = L x l = 12 m x 5 m = 60 m²

Answer 2

$L^2 = D^2 - l^2 \\ L^2 = 13^2 - 5^2 \\ L^2 = 169 - 25 \\ L^2 = 144 \Rightarrow \boxed{ L = 12} \\ \\ \\ A= L \cdot l \\ \\ A = 12 \cdot 5 \\ \\ \boxed{A = 60~m^2 }$