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kita harus mengetaui terlebih dulu 1 putaran = 360 derajat = 2π radian
jadi 1 radian = 360 derajat / 2π
berarti 360 derajat = 2π radian
no 2.
1 hektar setara dengan 100 meter x 100 meter atau 10.000 meter persegi
Semoga membantu :) D