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Keliling = phi • D =1/2 x 22/7 x 28 =44 cm
(Setengah lingkaran kecil bisa dipindah ke bagian atas jadi membentuk 1/2 lingkaran)
Gambar 2
Keliling = (26x4) + 2( 1/4 x phi x D)
= 104 cm + 22 cm
= 126 cm
= 1/2 x 2 x 22/7 x14
= 44 cm
2. k = s² + 1/2πd
= 40² + 1/2 x 22/7x28
= 1600 + 44
= 1644 cm
maaf klo salah smg membantu........