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= (8 cm)² - (1/2 x 8 cm)²
= (8 cm)² - (4 cm)²
= 64 cm² - 16 cm²
= 48 cm
tinggi = √(48 cm)
= 6,928 cm
L = 1/2 × alas × tinggi
= 1/2 × 8 cm × 6,928 cm
= 1/2 × 55,424 cm²
= 27,712 cm²
atau :
L = s² ×
= (8 cm)² ×
= 64 cm² ×
= 27,712 cm²