Oblicz pola figur zamalowanych na rysunkach, wiedząc, że każdy z narysowanych kwadratów ma bok o długości 4.
1)
Kwadrat dzielę na 4 kwadraty
Pole takiego kwadratu P1 = 2^2 = 4
Pole ćwiartki koła o r = 2
P2 = (1/4) pi*r^2 = (1/4) pi*2^2 = ( 1/4) *pi*4 = pi
Pole jednego listka
P3 = P1- 2*[ P1 - P2] = 4 - 2*( 4 - pi] = 4 - 8 + 2 pi = 2 pi - 4
Pole całej figury ( 4 listki)
P = 4*P3 = 4*( 2 pi - 4) = 8 pi - 16 = około 9,12
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2)
Pole kwadratu o boku 4
P1 = 4^2 = 16
Pole ćwiartki koła o promieniu r = 4
P2 = (1/4) pi*4^2 = (1/4) pi*16 = 4 pi
P3 = P1 - P2 = 16 - 4 pi
Pole półkola o r = 2
P4 = (1/2) pi*2^2 = 2 pi
Pole jednego listka - jak w z.1
P 5 = 2 pi - 4
P6 = P4 - P5 = 2 pi - ( 2 pi - 4) = 4
Pole figury
P = P1 - P3 - 2*P6 = 16 - ( 16 - 4 pi) - 2*4 = 4 pi - 8 = 4*( pi - 2)
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1)
Kwadrat dzielę na 4 kwadraty
Pole takiego kwadratu P1 = 2^2 = 4
Pole ćwiartki koła o r = 2
P2 = (1/4) pi*r^2 = (1/4) pi*2^2 = ( 1/4) *pi*4 = pi
Pole jednego listka
P3 = P1- 2*[ P1 - P2] = 4 - 2*( 4 - pi] = 4 - 8 + 2 pi = 2 pi - 4
Pole całej figury ( 4 listki)
P = 4*P3 = 4*( 2 pi - 4) = 8 pi - 16 = około 9,12
========================================
2)
Pole kwadratu o boku 4
P1 = 4^2 = 16
Pole ćwiartki koła o promieniu r = 4
P2 = (1/4) pi*4^2 = (1/4) pi*16 = 4 pi
P3 = P1 - P2 = 16 - 4 pi
Pole półkola o r = 2
P4 = (1/2) pi*2^2 = 2 pi
Pole jednego listka - jak w z.1
P 5 = 2 pi - 4
P6 = P4 - P5 = 2 pi - ( 2 pi - 4) = 4
Pole figury
P = P1 - P3 - 2*P6 = 16 - ( 16 - 4 pi) - 2*4 = 4 pi - 8 = 4*( pi - 2)
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