Odpowiedź:
Zad.11
a) Pole= 1/2 (8+10)·3 + 1/2·(10+6)·4= 1/2·18·3 + 1/2·16·4 = 27+32= 59
b) Pole= 1/2·4·6 + 1/2·(7+3)·6 = 12+ 1/2·10·6 = 12+30=42
c) Pole= 1/2·6·8 + 1/2·(4+10)·3= 24+1/2·14·3=24+21=45
Zad.15
wzór na pole trapezu P=(a+b)·h/2
h- wys. trapezu ;
a,b-podstawy trapezu
a)
a=17
b=8
P=100
h=2P/(a+b)=2·100/(17+8)=200/25=8;
P₁=a·h/2=17·8/2=17·4=68
P₂=b·h/2=8·8/2=64/2=32
b)
a=2
b=23
P=(a+b)·h/2=(2+23)·h/2=25·h/2;
h=2P/25=2·100/25=200/25=8
P₁=a·h/2=2·8/2=8
P₂=b·h/2=23·8/2=23·4=92
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Odpowiedź:
Zad.11
a) Pole= 1/2 (8+10)·3 + 1/2·(10+6)·4= 1/2·18·3 + 1/2·16·4 = 27+32= 59
b) Pole= 1/2·4·6 + 1/2·(7+3)·6 = 12+ 1/2·10·6 = 12+30=42
c) Pole= 1/2·6·8 + 1/2·(4+10)·3= 24+1/2·14·3=24+21=45
Zad.15
wzór na pole trapezu P=(a+b)·h/2
h- wys. trapezu ;
a,b-podstawy trapezu
a)
a=17
b=8
P=100
h=2P/(a+b)=2·100/(17+8)=200/25=8;
P₁=a·h/2=17·8/2=17·4=68
P₂=b·h/2=8·8/2=64/2=32
b)
a=2
b=23
P=(a+b)·h/2=(2+23)·h/2=25·h/2;
h=2P/25=2·100/25=200/25=8
P₁=a·h/2=2·8/2=8
P₂=b·h/2=23·8/2=23·4=92
Szczegółowe wyjaśnienie: