Odpowiedź :
a)
[tex] \frac{a \times h}{2} = \frac{5 \times 7}{2} = \frac{35}{2} = 17.5 {cm}^{2} [/tex]
b)
[tex]40 = \frac{4 \times x}{2} | \times 2 \\ 80 = 4x | \div 4 \\ x = 20cm[/tex]
a)a=5cm , b= 7cm .
P = ab/2
P = (5cm · 7cm)/2
P = 35/2 cm^2
b) a=4cm, P = 40cm^2
P = ab/2
40cm^2 = 4(cm)b/2
40cm^2 = 2b(cm) / : 2cm
20cm = b
Liczę na naj
P = ab/2
P = (5cm · 7cm)/2
P = 35/2 cm^2
b) a=4cm, P = 40cm^2
P = ab/2
40cm^2 = 4(cm)b/2
40cm^2 = 2b(cm) / : 2cm
20cm = b
Liczę na naj