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L=a²/4 √3
L=8²/4 √3
L=64/4 √3
L=16√3 cm²
tinggi segitiga (T) = √8² - 4²
=√64-16
=√48
=√16 x3
=4√3
Luas segitaga = 1/2alasx tinggi
= 1/2 x 8 x4√3
= 16√3