Odpowiedź:
b = 7 [tex]\frac{8}{23} + 5 \frac{15}{23}[/tex] = 13 - dł. ramienia Δ
a - długość podstawy Δ
a) Z tw. o dwusiecznej kąta mamy
[tex]\frac{a}{b} = \frac{5\frac{15}{23} }{7\frac{8}{23} }[/tex]
[tex]\frac{a}{13} = \frac{130}{23} : \frac{169}{23} = \frac{130}{23} *\frac{23}{169} = \frac{10}{13}[/tex]
więc
a = 10
=====
b ) h² + 5² = 13² ⇒ h² = 169 - 25 = 144
h = [tex]\sqrt{144} = 12[/tex]
Pole Δ
P = 0,5 a*h = 0,5*10*12 = 60 j²
oraz P = [tex]\frac{a*b*c}{ 4 R}[/tex] gdzie a = 10 b = c = 13
4 P*R = a*b*c
R = [tex]\frac{a*b*c}{4 P} = \frac{10*13*13}{4*60} = \frac{169}{24} = 7 \frac{1}{24}[/tex]
=============================
c) P = p*r
gdzie p = ( 10 + 13 + 13) : 2 = 36 : 2 = 18
60 = 18*r
r = 60 : 18 = [tex]\frac{10}{3} =[/tex] 3 [tex]\frac{1}{3}[/tex]
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Odpowiedź:
b = 7 [tex]\frac{8}{23} + 5 \frac{15}{23}[/tex] = 13 - dł. ramienia Δ
a - długość podstawy Δ
a) Z tw. o dwusiecznej kąta mamy
[tex]\frac{a}{b} = \frac{5\frac{15}{23} }{7\frac{8}{23} }[/tex]
[tex]\frac{a}{13} = \frac{130}{23} : \frac{169}{23} = \frac{130}{23} *\frac{23}{169} = \frac{10}{13}[/tex]
więc
a = 10
=====
b ) h² + 5² = 13² ⇒ h² = 169 - 25 = 144
h = [tex]\sqrt{144} = 12[/tex]
Pole Δ
P = 0,5 a*h = 0,5*10*12 = 60 j²
oraz P = [tex]\frac{a*b*c}{ 4 R}[/tex] gdzie a = 10 b = c = 13
4 P*R = a*b*c
R = [tex]\frac{a*b*c}{4 P} = \frac{10*13*13}{4*60} = \frac{169}{24} = 7 \frac{1}{24}[/tex]
=============================
c) P = p*r
gdzie p = ( 10 + 13 + 13) : 2 = 36 : 2 = 18
60 = 18*r
r = 60 : 18 = [tex]\frac{10}{3} =[/tex] 3 [tex]\frac{1}{3}[/tex]
====================
Szczegółowe wyjaśnienie: