Question

Fie triunghiul dreptunghic ABC, cu m(A)=90°. Se cunosc AB=7 cm si cos B= 7/25. Calculati AC, BC, cos C, tg B, ctg C. Va rog muuuult! e urgent​

Answer 1

cosB= AB/BC=7/25 => BC=25

∆ABC drept. => T. Pitagora => BC patrat=AB patrat + AC patrat => 625-49= AC patrat => 576=AC patrat => AC=24

cosC=AC/BC =24/25

tgB=AC/AB => 24/7

ctgC=AC/AB => 24/7