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maka
x = √12² +5²
x = √144+25
x= √169
x=13
Lp = L. alas + 4. L. sisi tegak limas
= (10 cm)² + 4. 10 cm. 13 cm
= 100 cm² + 520 cm²
= 620 cm²
Jadi luas permukaan limas tsb adalah 620 cm²