Question

Triunghiul ABC -isoscel, AD perpendicular cu BC , BC=10 cm ,AD=12 cm . Aflati perimetrul lui ABC

Answer 1

∆ABC isoscel

AD-inaltime =>AD-mediana=>BC=CD=10:2=5

∆ABD, <D=90°=>(TP)=>5²+12²=AB²

25+144=AB²

AB=√169=13

P∆ABC=13×2+10

P∆ABC=26+10

P∆ABC=36cm