Question

URGENT !!
5 Stele
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Answer 1

45. A=l² ⇒l=√16=4 cm

R=l/2=2 cm

46.At=l²√3=9²√3=81√3 cm²

47.Formula lui Heron

S=√p(p-a)(p-b)(p-c)

p=(a+b+c)/2=30/2=15

S=√15.(15-12)(15-8)(15-10)=√15·3·7.5=15√7

48.A=πR²=π10²=100πcm²

49.A=AB·AC·sin ∡A/2=6.8.√3/2·1/2=12√3 cm²

50.60°

51.∡A=120° ⇒∡B=∡∡C=(180-120)/2=30°

52.P=3xl=3x5=15 cm

53. Ip=6√2

ip=l√2 ⇒l= c1=c2= 6 cm

54.A=AB²=6²=36 cm²

55.A treia zi=100%-35%-20%=45%