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jp' = 15' + (10-2)'
jp' = 225 + 64
jp = √ 289
= 17
r2=2cm
gl=15cm
J²=(gl)²+(r1-r2)²
=15²+(10-2)²
=15²+8²
=225+64
J²=289
J=√289
J=17cm
maaf jika salah, semoga membantu..