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b. L ly" = d1 . d2 / 2 = 18 . 45 / 2 = 9. 45 = 405cm2
diagonal pendek = pd
a. pj = 2 1/2 pd
pj = 5/2 pd
pd = 18
pj = 5/2 (18)
pj = 45 cm
b. luas =
=
= 405 cm^2