Question

1. hitunglah busur BC
2. Jika panjang busur AB= 12 Cm Hitunglah panjang busur CD



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Answer 1

1. Jika ∠BOC siku-siku:

Panjang busur/K lingkaran = Sudut pusat/360°

BC/2πr = ∠BOC/360°

BC/(2 x 22/7 x 7) = 90°/360°

BC/44 = 1/4

BC/11 = 1/1

BC = 11 cm

Jadi, panjang busur BC adalah 11 cm.

2. Panjang busur/K lingkaran = Sudut pusat/360°

Busur/Sudut = K/360°

Busur x 360/Sudut = Busur x 360/Sudut

CD x 360/60 = AB x 360/30

CD x 6 = 12 x 12

CD = 12 x 12/6

CD = 12 x 2

CD = 24 cm

Jadi, panjang busur CD adalah 24 cm.

Answer 2

Penjelasan dengan langkah-langkah:

1.

Jika BOC = 90°

maka

Busur BC

= 90° × 22/7 × 2(7)

= 90/360 × 22/7 × 14

= 1/4 × 44

= 11 cm

..

2.

Busur CD/Busur AB = θ CD/θ AB

Busur CD/12 cm = 60°/30°

Busur CD = 12 cm × 2

Busur CD = 24 cm

[tex]\boxed{\colorbox{ccddff}{Answered by Danial Alf'at}}[/tex]