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Problema 2 va rog frumos .

Problema 2 Va Rog Frumos class=

Răspuns :

A= √(p(p-30) (p-51) (p-63))
unde p=(30+51+63):2=144/2=72
 A=√(72*42*21*9)=√(36*2*2*21*21*9)=6*2*21*3=36*21=756
AD este inaltimea coresp. laturii BC=63
63*AD/2=756=36*21
AD= 2*36*21/63=2*36/3=2*12=24
 dupa indoire,
(ABD) ∩(ACD)=AD⇒BD⊥DC,  BDC dreptunghic in D, BC ipotenuza

BD=√(30²-24²)=18
DC=63-18=45
BC²=√(18²+45²)= 9√2² +5²)=9√29 cm
 
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