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jawaban bisa liat di gambar..Sekolah Dasar Kelas VI
Diameter !
a ) L = phi × r × r
706,5 = 3,14 × r × r
r × r = 706,5 ÷ 3,14
r × r = 225
r = akar kuadrat dari 225
r = 15
d = 15 × 2 = 30 cm
b ) L = phi × r × r
3.850 cm3 = 3,14 × r × r
r × r = 3850 ÷ 22/7
r × r = 25 cm
r = akar kuadrat dari 25 cm
= 5 cm × 2
d = 10 cm
Keliling !
a) L = phi × r × r
50,24 = 3,14 × r × r
r × r = 50,24 ÷ 3,14
r × r = 16
r = akar kuadrat dari 16
r = 4
d = 4 × 2
d = 8
K = phi × d
= 3,14 × 8
= 25,12 cm
b) L = phi × r × r
38,5 = 22/7 × r × r
r × r = 385 ÷ 22/7
r × r = 0,25
r = akar kuadrat dari 0,25
r = 0,5
d = 0,5 × 2
d = 1
K = phi × d
= 3,14 × 1
= 3,14 cm