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Verified answer
Diketahui:panjang sisi alas= 18 cm
tinggi Limas= 12 cm
ditanya: luas permukaan Limas....?
jawab:
luas alas= sisi×sisi
= 18×18
= 324 cm²
tinggi sisi tegak= √12²+9²
= √144+81
= √225
= 25 cm
luas selimut Limas= 4×sisi alas×tinggi sisi tegak/2
= 4×18×25/2
= 1800/2
= 900 cm²
luas permukaan= luas alas+luas selimut Limas
= 324+900
= 1224 cm²