bardzo bym prosil o zrobienie zadan z zalacznika :P od 14.12 do 14.17 :) bede bardzo wdzieczny daje 5 i naj i ddziekuje
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14.12
AB=15cm
CD=18cm
PR || AB
h=6cm
P ABC= 1/2 * 15 * 18 = 135 cm²
P ABPR + P CRP = P ABC
1/2 * (AB + PR) *h + 1/2*PR* (DC-h) = P ABC
1/2*(15+PR)*6 + 1/2*PR * (18- 6) = 135
45 + 3PR + 6PR =135
9PR = 90
PR = 10cm
P CPR = 1/2 * PR * (CD-h)
P CPR = 1/2 * 10 * 12 = 60 cm²
14.17
5m/8m=x/20m
100=8x /:8
x=12,5m