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=√289-15² =√625-15²
=√289-225 =√625-225
=√64 =8cm =√400 =20cm
L.layang-layang= d1xd2
2
= 30x(20+8)
2
=15 x 28 = 420 cm²
Itu jawabannya sama caranya.. Yoroshiku ^^