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maaf kalau salah
=9²+12²
=81+144
=√225
=15
DC=DA
AB²=AO²+OB²
=12²+16²
144+256
=√400
=20
AB=CB
a) Kel=DA+DC+AB+CB
=15+15+20+20
=30+40
=70
b)L= d1 ×d2
2
=24 + 25
2
=12×25
=37