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radian4dRADIAN4D Portal resmi Dinas Kehutanan Kalimantan Tengah – pusat informasi kebijakan, pelestarian hutan, reboisasi, dan pengelolaan sumber daya alam berkelanjutan.Radians Preferred by Mathematicians. Since a radian is based on the pure idea of laying the radius along the circumference it leads to cleaner, more natural