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12.12 + 5.5 = t²
144 + 25 = t²
169 = t²
t = √169
t = 13 cm
L seluruh bidang sisi limas = 4 (1/2.a.t) + s²
= 4 (1/2.10.13) + 10²
= 4 (65) + 100
= 260 + 100
= 360 cm² :)