liwonsubagyo
1) a) keliling = 2 x π x r = 2 x 22 x 14 7 = 88cm b) panjang busur = Sudut AOB x 2 x π x r 360 = 72 x 2 x 22 x 14 360 7 = 1 x 2 x 22 x 2 5 = 17,6cm c) L.lingkaran = π x r² = 22 x 14² 7 = 616cm³ d) L. juring = Sdut AOB x π x r² 360 = 72 x 22 x 14 x 14 360 7 = 1 x 22 x 2 x 14 5 = 123,2 cm² 2) a) = 90 x 30 60 = 45cm b ) = 60 x 75 90 = 50cm² 3) a ) L = π x r² = 3.14 x 10 x 10 = 314cm² b ) L.juring = 90 x 3,14 x 10 x 10 360 = 78,5cm² c ) L Δ = 1/2 x a x t = 5 x 10 = 50cm² d) Luas tembereng = 78,5 - 50 = 28,5cm²
= 2 x x 14
= 88 cm
b. panjang busur = x K lingkaran
= x 88
= 17, 6 cm
c. luas lingkaran =
= x
= 616 cm2
d. x Luas lingkaran
= x 616
= 123,2 cm2
2. a. x 30
= 45 cm
itu aja yg aku tau hehe semoga membantu ^^
= 2 x 22 x 14
7
= 88cm
b) panjang busur = Sudut AOB x 2 x π x r
360
= 72 x 2 x 22 x 14
360 7
= 1 x 2 x 22 x 2
5
= 17,6cm
c) L.lingkaran = π x r²
= 22 x 14²
7
= 616cm³
d) L. juring = Sdut AOB x π x r²
360
= 72 x 22 x 14 x 14
360 7
= 1 x 22 x 2 x 14
5
= 123,2 cm²
2) a) = 90 x 30
60
= 45cm
b ) = 60 x 75
90
= 50cm²
3) a ) L = π x r²
= 3.14 x 10 x 10
= 314cm²
b ) L.juring = 90 x 3,14 x 10 x 10
360
= 78,5cm²
c ) L Δ = 1/2 x a x t
= 5 x 10
= 50cm²
d) Luas tembereng = 78,5 - 50
= 28,5cm²