Penjelasan dengan langkah-langkah:
14. Diameter = 2r
= 2(10 cm)
= 20 cm (D)
15. P lengkung AB = 1/2 x K lingkaran
= 1/2 x π x d
= 1/2 x 22/7 x 14 cm
= 22 cm (A)
16. L lingkaran = 154 m²
π x r² = 154 m²
22/7 x r² = 154 m²
r² = (154 m²) / (22/7)
= 154 m² x 7/22
= 49 m²
r = √49 m²
= 7 m
K lingkaran = 2 x π x r
= 2 x 22/7 x 7 m
= 44 m (B)
17. L juring = 90°/360° x luas lingkaran
= 1/4 x π x r²
= 1/4 x 3,14 x (10 m)²
= 1/4 x 3,14 x 100 m²
= 78,5 cm² (B)
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Penjelasan dengan langkah-langkah:
14. Diameter = 2r
= 2(10 cm)
= 20 cm (D)
15. P lengkung AB = 1/2 x K lingkaran
= 1/2 x π x d
= 1/2 x 22/7 x 14 cm
= 22 cm (A)
16. L lingkaran = 154 m²
π x r² = 154 m²
22/7 x r² = 154 m²
r² = (154 m²) / (22/7)
= 154 m² x 7/22
= 49 m²
r = √49 m²
= 7 m
K lingkaran = 2 x π x r
= 2 x 22/7 x 7 m
= 44 m (B)
17. L juring = 90°/360° x luas lingkaran
= 1/4 x π x r²
= 1/4 x 3,14 x (10 m)²
= 1/4 x 3,14 x 100 m²
= 78,5 cm² (B)