Jawaban:

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Penjelasan dengan langkah-langkah:

1) Lp = (2 x L. Alas) + (K. Alas x T. Prisma)

= (2 x (½ x a x t)) + ((a + b + c) x T. Prisma)

= (2 x (½ x 12 x 8)) + ((12 + 10 + 10) x 25)

= (2 x 48) + (32 x 25)

= 96 + 800

= 896 cm²

2) Lp = ((2 x L. Alas) + (K. Alas x T. Prisma)) - (L. Δ)

= ((2 x (½ x a x t)) + ((a + b + c) x T. Prisma)) - (½ x a x t)

= ((2 x (½ x 12 x 16)) + ((12 + 16 + 20) x 20)) - (½ x 12 x 16)

= ((2 x 96) + (48 x 20)) - 96

= (192 + 960) - 96

= 1.152 - 96

= 1.056 cm²

3) r = d/2 = 28/2 = 14 cm

Lp = 2πr (r + t) = 2 x 22/7 x 14 (14 + 40) = 88 x 54 = 4.752 cm²

4) Lp = 2πr (r + t) = 2 x 3,14 x 3 (3 + 12) = 18,84 x 15 = 282,6 cm²