Question

Yang bisa tolong bantu jawab ya no.5 bagian c dan no. 6. Makasih ya :) Gbu

Answer 1

[3]
Jarak tempuh roda = Keliling roda x banyak putaran
                               = [22/7 x 42] x 50
                               = 132 x 50
                               = 6.600 cm = 66 m

[4]
Jarak tempuh = keliling x banyak putaran
550 = [22/7 x 56] x putaran
550 = 176 x putaran
Banyak putaran oleh pelari = 550/176 = 3,125 putaran atau 3 1/8 putaran

[5] Keliling daerah yang diarsir
(a) Keliling arsiran = [22/7 x 7] + [22/7 x 14]
                              = 22 + 44
                              = 66 cm
(b) Keliling arsiran = [22/7 x 28] + 2 x [22/7 x 14]
                              = 88 + 88
                              = 176 cm
(c) Keliling arsiran = [4 x 10] + [3,14 x 10]
                              = 40 + 31,4
                              = 71,4 cm

[6]
Keliling stadion = 22/7 x 105
                         = 22 x 15
                         = 330 m
Banyak lampu yang akan dipasang = keliling : jarak antar lampu
                                                         = 330 : 33
                                                         = 10 lampu