Oblicz pole trapezu ABDE wiedząc że
DE = 5 kreska ułamkowa 6 z AB.
Załącznik!
h = 24cm
a = podstawa = 3/4 × 24 = 18cm
I DE I = 5/6 × 18 = 15cm
j=wysokosc trójkąta EDC
18/15 = 24/j
18j = 15 × 24
j = 360 : 18 = 20
t = wysokosc trapezu
m = 24-20 = 4cm
pole trapezu=1/2(18+15) × 4 = 66cm²
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h = 24cm
a = podstawa = 3/4 × 24 = 18cm
I DE I = 5/6 × 18 = 15cm
j=wysokosc trójkąta EDC
18/15 = 24/j
18j = 15 × 24
j = 360 : 18 = 20
t = wysokosc trapezu
m = 24-20 = 4cm
pole trapezu=1/2(18+15) × 4 = 66cm²