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ts^2 = 12^2 + (10/2)^2
= 12^2 + 5^2
= 144 + 25
= 169
ts = akar169
ts = 13
LP = L.alas + 4 L.segitiga
= (10 × 10) + (4 × 1/2 × 10 × 13)
= 100 + 260
= 360 cm^2