jika luas trapesium siku siku ABED adalah 300cm2 luas trapesium ABCD adalah....cm2

L = 300
(AB+DE)×BE/2 = 300
(16+24)×BE = 300×2
40×BE = 600
BE = 600/40
BE = 15 cm

EC^2 = BC^2 - BE^2
EC^2 = 25^2 - 15^2
EC^2 = 625 - 225
EC^2 = 400
EC = akar400
EC = 20 cm

CD = DE+EC = 24+20 = 44 cm

LuasABCD = (AB+CD)×BE/2 = (16+44)×15/2 = 60×15/2 = 30×15 = 450 cm^2

Jwb. B

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