tolong bantu jawab ya trims Pelajaran kelas 6SD

11.)

diameter = 20 cm
radius. = 10 cm
3.14 × 10 × 10 = 314 cm2
3.14 × 5 × 5. = 78.5 cm2
314 - 78.5 = 235.5 cm2 = a.

12.)

La = volume ÷ tinggi
volume = 728 cm3
tinggi. = 13 cm
La. = 728 ÷ 13 = 56 cm2 = c.

13.)

volume = La × tinggi
volume = 1/2 × 3 × 4 × 13 = 78 cm3 = b.

14.)

volume = La × tinggi
volume = 1/4 × 22/7 ×21×21×26 = 9.009cm3 = c.