pls, buat besok pagi, jangan asal

Mapel : Matematika 
Materi : Sudut dan Lingkaran

[tex]Luas\ Juring= \frac{Sudut\ Pusat}{360}\times Luas\ Lingkaran\\ \\Soal\ a.\\ \\Luas\ Juring= \frac{100}{360}\times(3,14)\times 6^2\\ \\Luas\ Juring= \frac{10}{36}\times(3,14) \times 36\\ \\Luas\ Juring=10\times3,14\\ \\ Luas\ Juring=31,4\ cm^2\\ \\ \\ \\Soal\ b.\\ \\31,4= \frac{25}{360}\times(3,14)\times r^2\\ \\r^2= \frac{31,4}{3,14}\times \frac{360}{25}\\ \\r^2=10\times(14,4)\\ \\r^2=144\\ \\r= \sqrt{144}\\ \\r=12\ cm[/tex]

[tex]Soal\ c.\\ \\8.478= \frac{Sudut\ Pusat}{360}\times(3,14)\times 90^2\\ \\8.478= \frac{Sudut\ Pusat}{360}\times(3,14)\times 8.100 \\ \\ 8.478= \frac{Sudut\ Pusat}{360}\times25.434 \\ \\ Sudut\ Pusat= \frac{8.478}{25.434}\times360 \\ \\Sudut\ Pusat= \frac{1}{3}\times360 \\ \\ Sudut\ Pusat= 120^o [/tex]

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