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L = πr² Maka, L ~ r²
R : r = 35² : 14²
R : r = 5² : 2²
R : r = 25 : 4
L₁ = π × r²
= 22/7 × 14²
= 22/7 × 196
= 22 × 28
= 616 cm²
L₂ = π × r²
= 22/7 × 35²
= 22/7 × 1.225
= 22 × 175
= 3.850 cm²
L₁ : L₂ = 616 cm² : 3.850 cm²
= 4 : 25
Nomor 2 ~>
L = π × r²
616 = 22/7 × r²
r² = 616 × 7/22
r² = 28 × 7
r² = 196
√r² = √196
r = 14
Nomor 3 ~>
Busur = α/360 × K lingkaran
44 = α/360 × 2 × π × r
44 = α/360 × 2 × 22/7 × 35
44 = α/360 × 2 × 22 × 5
44 × 360 = α × 2 × 22 × 5
15.840 = 220α
72 = α