No15.
menngunakan rumus luas juring
[tex] \frac{ \alpha }{360} \pi r {}^{2} [/tex]
=36/360*22/7*21*21
=1/10*22*3*21
=1386/10
=138,6cm²
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No15.
menngunakan rumus luas juring
[tex] \frac{ \alpha }{360} \pi r {}^{2} [/tex]
=36/360*22/7*21*21
=1/10*22*3*21
=1386/10
=138,6cm²