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Nomer 20
Sisi=akar(2^2+3^2)=akar(4+9)=akar13
Luas persegi = (akar13)^2=13
t = tinggi tembok
t² = 5²-1,4²
t² = 25-1,96
t² = 23,04
t = √23,04
t = 4,8 meter (jawaban A)