oblicz pole trapezu :
a=28cm b=7cm c=17cm d=10cm
P = ¼ × (28 + 7) / (28 - 7) √(28 - 7 + 17 + 10) √(28 - 7 - 17 + 10) √(28 - 7 + 17 - 10) √(-28 + 7 + 17 + 10)
P = ¼ × 35/21 × √48 × √14 × √28 × √6
P = 35/84 × 336 = 140 cm²
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P = ¼ × (28 + 7) / (28 - 7) √(28 - 7 + 17 + 10) √(28 - 7 - 17 + 10) √(28 - 7 + 17 - 10) √(-28 + 7 + 17 + 10)
P = ¼ × 35/21 × √48 × √14 × √28 × √6
P = 35/84 × 336 = 140 cm²