👤

1. In trapezul dreptunghic ABCD, AB II CD, m(

Răspuns :

Linia mijlocie=(B+b)/2
6+B=18x2=36
B=36-6=30 cm=DC
Aplicam Th Inaltimii in tr dreptunghic DBC
BE _|_ DC cu E∈DC
BE²=DExEC
EC=24
DE=6
BE²=24*6=144
BE=12 cm