Wzór na pole trapezu: P= (a+b)* h/2
Zad. 3
drugi podpunkt
P= (3+1)*8/2 = 4*8/2 = 32/2 = 16cm^2
trzeci podpunkt
P=(3+4)*7/2 = 7*7/2 = 49/2 =24,5cm^2
Zad.4
a)
a=21cm
b= 7cm
h= 12cm
P=(21+7)*12/2 = 28*12/2 = 336/2=168cm^2
Obw. = 7+21+13+15= 56cm
b)
a= 6cm
b= 12cm
h= 8cm
P=(6+12)*8/2=18*8/2 =144/2 = 72cm^2
Obw. = 6+12+8+10 = 36cm
