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4 = 1/2 × 2 × t
t=4
T/t = xy/my
T/4 = 5/2
T = 10
luas xyz = 1/2 × xy × T
= 1/2 × 5 × 10
= 25
luas mnzx = luas xyz - luas myn
= 25 - 4 =21
bintang 5 nya eaaa.?
:)