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Yasudah saya isi dua duanya :D
Keliling seperempat lingkaran
=1/4×2(phi)r
=1/4×2×3,14×20
=10×3,14
=31,4cm
Luas sepermpat lingkaran
=1/4(phi)r^2
=1/4×3,14×20×20
=3,14×5×20
=3,14×100
=314cm2
Semoga membantu