Jawaban:

1. 5 sisi, 6 titik sudut, 9 rusuk

2. 360 cm³

3. 2.250 cm³

4. 20cm

5. 65 cm²

6. 4.620 xm³

7. 3.768 cm³

8. 7 cm

Penjelasan dengan langkah-langkah:

2. V = L alas x t

V = (½ x a x t) x t = (½ x 6 x 8) x 15 = (48/2) x 15 = 24 x 15 = 360 cm³

3. V = (½ x 10 x 15) x 30 = 150/2 x 30 = 75 x 30 = 2.250 cm²

4. La = phi x r x r = 22/7 x 7 x 7 = 22 x 7 = 154 cm²

t = V/La = 3080/154 = 20 cm

5. La = V/t = 780/12 = 65 cm²

6. K = 2 x phi x r

44 = 2 x 22/7 x r

44 = 44/7 x r

r = 44 x 7/44 = 7 cm (44 dicoret)

V = phi x r² x t = 22/7 x 7 x 7 x 30 = (/7 x 7 dicoret) = 154 x 30 = 4.620 cm³

7. V= La x t, La = phi x r²

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

V = (3,14 x 10 x 10) x 12 = 314 x 12 = 3.768 cm³

8. r = √1.450/ 22/7 x 10 = √1.540/220/7 = √1540/31,4 = √49 = 7 cm