Penjelasan dengan langkah-langkah:
Luas permukaan
= 2 . Luas alas + keliling alas . tp
[tex] \tt= 2 \times( \frac{1}{2} \times 9 \times 12) + (9 + 12 + 15) \times 20[/tex]
[tex] \tt = 108 + 36 \times 20[/tex]
[tex] = \tt108 +720[/tex]
[tex] \tt = 828 \: \: cm {}^{2} [/tex]
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Penjelasan dengan langkah-langkah:
Luas permukaan
= 2 . Luas alas + keliling alas . tp
[tex] \tt= 2 \times( \frac{1}{2} \times 9 \times 12) + (9 + 12 + 15) \times 20[/tex]
[tex] \tt = 108 + 36 \times 20[/tex]
[tex] = \tt108 +720[/tex]
[tex] \tt = 828 \: \: cm {}^{2} [/tex]