Question

rezolvati pe o foaie ​

Answer 1

Explicație pas cu pas:

$0.25 = \dfrac{1}{4}$

$\dfrac{AE}{EC} = \dfrac{1}{4} \iff \dfrac{AE}{AE + EC} = \dfrac{1}{1 + 4} \\ \dfrac{AE}{AC} = \dfrac{1}{5} \implies \dfrac{AD}{AB} = \dfrac{1}{5}$

$\dfrac{AD}{20} = \dfrac{1}{5} \iff AD = \dfrac{20}{5} \\ \implies AD = 4 \ cm$