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r = 5
S - pole wycinka
S = ½α * r² = ½*72*25 = 900 cm²
b)
α = 150°
l = ½π = 90°
l = α * r
r = l/α = ½π/150° = 90°/150° = 0,6
r = 5
P = 25π
Kąt 72° to ¹/₅ z 360°
Pole wycinka wynosi ¹/₅*25π = 5π j²
b)
150° = ⁵/₁₂ kąta 360°
⁵/₁₂*2πr = ½π | /π
⅚r = ½
r= ³/₅
alfa = 72 (stopnie)
Pw=(pi)r^(alfa)/360 (stopni)
Pw=(pi) *5^* 72(stopnie)/360 (stopni)
Pw=(pi)*25*72/360,
Pw= (pi)1800/360
Pw=5(pi)
^ to ozn do potegi 2
ł = (pi)r(alfa)/180 stopni
1/2 pi = pi * r *150/180
1/2 = r*15/18
r*15/18=1/2 /*18
r *15= 9/15
r=3/5