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PQ² = 13² - (8-3)²
PQ² = 169 - 5²
PQ² = 169 - 25
PQ² = 144
PQ = 12 cm
PQ = SR
12 = SR
Busur PS = (360 - 140) / 360 x π x 16
= 11 / 18 x π x 16
= 88π / 9
= 176π / 18
Busur QR = (360 - 220) / 360 x π x 3
= 7 / 18 x π x 3
= 21π / 18
Pjg = 12 + 12 + 176π/18 + 21π/18
= 24 + 197π / 18
= 24 + 197 . 3,14 / 18
= 24 + 34,37
= 58,37 cm