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t²Δ = 6² - 3²
= 36 - 9
= 27
t.Δ = √27
= √9 .√3
= 3√3 cm
AO = 2/3 .t.Δ ... ( dalili garis berat )
= (2/3) 3√3
= 2√3 cm
TO² = TA² - AO²
= 5² - (2√3)²
= 25 - 12
= 13
TO = √13 cm
jadi , tinggi limas = √13 cm
ket : pada Δ sama sisi grs tinggi = grs berat = grs bagi
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