Jawaban:

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Penjelasan dengan langkah-langkah:

1) Lp = L. Alas + (4 x L. Sisi Tegak)

= (s²) + (4 x (½ x a x t))

= (8²) + (4 x (½ x 8 x 7))

= 64 + (4 x 28)

= 64 + 112

= 176 cm²

2) Lp = L. Alas + (4 x L. Sisi Tegak)

= (p x l) + (2 x (½ x a x t)) + (2 x (½ x a x t))

= (20 x 18) + (2 x (½ x 20 x 16)) + (2 x (½ x 18 x 13))

= 360 + (2 x 160) + (2 x 117)

= 360 + 320 + 234

= 914 cm²

3) r = d/2 = 20/2 = 10 cm

s = √r² + t² = √10² + 24² = √100 + 576 = √676 = 26 cm

Lp = πr (r + s) = 3,14 x 10 (10 + 26) = 31,4 x 36 = 1.130,4 cm²

4) Lp = 4πr² = 4 x 22/7 x 28² = 9.856 cm²