9.15cm+2x50mm
=15cm+100mm
=15cm+10cm
25cm
11.PQ,SP
maaf no.12 saya tidak bisa bantu
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diameter dalam pipa + 2 kali ketebalan pipa
=15 cm+2 kali 55 mm
=15 cm +110 mm
=15 cm+ 11 mm
=26 cm.
11.RS,QR
nomor 12 sa tidak bisa bantu maaf yah
9.15cm+2x50mm
=15cm+100mm
=15cm+10cm
25cm
11.PQ,SP
maaf no.12 saya tidak bisa bantu