Question

Fie ABC un triunghi dreptunghic in A si AD ⊥ BC , D ∈ BC
a) BD = 0,8 cm , CD = 7,2 , calculati AD si BC
b) BD-3,5 cm , BC= 35 cm , calculati DC si AD
c) CD =0,12 cm , AD= 0,9 cm , calculati DB si BC

Answer 1

a)AD^2 =DB*DC
AD^2 =0.8*7.2 =5.76 cm
BC =0.8+7.2 = 8 cm

b)BC=35
   AD =3.5   => CD =35-3.5 =31.5 cm
AD^ 2=3.5*31.5 =110.25
AD =radical din 110.25 =10.5 cm

c)AD^2 =BD*DC
0.9^2 =BD*0.12
BD =0.9^2 : 0.12
BD =0.81 : 0.12 =6.75 cm
BC =6.75+0.12 =6.87 cm