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b = 8 cm
a² + b² = c²
6² + 8² = c²
36 + 64 = c²
100 = c²
√100 = √c²
10 = c
Ka = a + b + c
= 6 cm + 8 cm + 10 cm
= 24 cm
La = 1/2 × a × t
= 1/2 × 6 cm × 8 cm
= 3 cm × 8 cm
= 24 cm²
LP = 2(La) + (Ka × t)
= 2(24) + (24 × 20)
= 48 + 480
= 528 cm²
Jadi luas permukaannya adalah 528 cm²