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Maka,
a.
Dengan perbandingan:
PQ/QR = 60/45
PQ/10 = 4/3
PQ = 4 x 10 / 3
PQ = 40/3 cm
b.
Keliling, ambil salah satu,
Dengan perbandingan:
QR/K = 45/360
QR/K = 1/8
K = 8 QR
K = 8 x 10
K = 80 cm
Dan.
K = πd
80 = πd
d = 80/π cm
Jika dengan 22/7:
d = 560/22 cm
d = 280/11 cm
Untuk,
r = 1/2 d
r = 1/2 x 80/π
r = 40/π cm
Jika dengan 22/7:
d = 140/11 cm