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Alas sebuah prisma berbentuk segitiga siku-siku dengan panjang sis siku-siku 12 cm dan 16 cm. Jika tinggi prisma 25 cm. Tentukan luas permukaan prisma.

Alas sebuah prisma berbentuk segitiga siku-siku dengan panjang sis siku-siku 12 cm dan 16 cm. Jika tinggi prisma 25 cm. Tentukan luas permukaan prisma.

Jawaban:

begin mathsize 14px style panjang space sisi space miring space segitiga space siku minus siku equals square root of 12 squared plus 16 squared end root space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals square root of 144 plus 256 end root space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals square root of 400 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 20 space cm luas space permukaan equals open parentheses 2 cross times luas space alas close parentheses plus open parentheses keliling space alas cross times tinggi close parentheses space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals open parentheses 2 cross times 1 half cross times 12 cross times 16 close parentheses plus open parentheses open parentheses 12 plus 16 plus 20 close parentheses cross times 25 close parentheses space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals open parentheses 192 close parentheses plus open parentheses 48 cross times 25 close parentheses space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 192 plus 1.200 space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 1.392 space cm squared end style 

Jadi, luas permukaannya adalah begin mathsize 14px style 1.392 space cm squared end style.

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