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P=½d₁*d₂
P=½*6cm*3,5cm=3cm*3,5cm=10cm²
zad 5
P=½ah
P=½*12cm*4,2cm=6cm*4,2cm=25,2cm²
zad 6
P=ah
12,5cm²=2,5cm*h |:2,5cm
h=5cm
zad 7
P=½ah
P=½*8cm*7,4cm
P=4cm*7,4cm=29,6cm²
zad 8
P=½ah
16cm²=½a*8cm
a*4cm=16cm² | :4cm
a=4cm
zad 9
P=½ah
7,5cm²=½a*5cm
2,5cm*a=7,5cm² |:2,5cm
a=3cm
zad 10
P=½(a+b)h
25cm²=½(6cm+4cm)h
½*10cm*h=25cm²
5cm*h=25cm² |:5cm
h=5cm
P = 6x3,5 :2(pod kreską ułamkową) = 10,5
5) P = a razy h dzielone na 2
P = 12x4,2 :2(pod kreską ułamkową) = 25,2
6) P=a razy h
h = P podzielić na a
h = 12,5 : 2,5 = 5
7) P = a razy h
P = 8x 7,4 = 59,2
8) a = 2P : h
a = 2x16:8 = 4
10) h = 2P : a+b
h = 2x25 : 6+4
h = 50 : 10 = 5
1/2×6×3,5=10,5
zad 5
1/2×12×4,2=25,5
zad 6
P=a×h
h=P÷a
h= 12,5÷2,5=5
zad 7
1/2×8×7,4=29,6
zad 8
P=1/2a×h
a=P÷h÷1/2
a=16÷8×2
a=4
zad 9
a=P÷h÷1/2
a=7,5÷5×2=3
zad 10
h=P÷1/2(a+b)
h=25÷1/2(6+4)
h=5