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Sudut : Pelurus = 2 : 3
Misalkan x sebagai variable pengganti, maka
Sudut : Pelurus = 2x : 3x
Sudut + Pelurus = 180°
2x + 3x = 180°
5x = 180°
x = 36°
Besar Sudut = 2x = 2 . 36° = 72°
Penyiku = 90° - 72° = 18° (A)
32.
Sudut CBQ + Sudut RQB = 180°
(4x - 4°) + (2x + 7°) = 180°
6x + 3° = 180°
6x = 177°
x = 29,5°
Sudut CBD = Sudut RQB
Sudut CBD
= 2x + 7°
= 2 . 29,5° + 7°
= 59° + 7°
= 66° (C)
33.
∠A1 = 120°
∠A1 berpelurus dengan ∠A2, maka
∠A1 + ∠A2 = 180°
120° + ∠A2 = 180°
∠A2 = 60°
∠A1 bertolak belakang dgn ∠A3
maka ∠A3 = ∠A1 = 120°
∠A2 sehadap ∠B2
∠B4 bertolak belakang dgn ∠B2
maka ∠B4 = ∠A2 = 60°
∠C2 sehadap dgn ∠A2
maka ∠C2 = ∠A2 = 60°
∠A3 + ∠B4 + ∠C2 = 240° (A)
Semoga membantu :)
pelurusnya = 180 - a
a = 2/3 (180-a)
3a = 360 - 2a
3a+2a = 360
5a = 360
a = 360/5
a = 72 derajat
Penyiku dari a
= 90 - 72
= 18 derajat (A)
32. sudut CBD = sudut RQB = 2x+7
jadi
(2x+7) + (4x-4) = 180
6x + 3 = 180
6x = 180-3
6x = 177
x = 29,5 derajat
sudut CBD = 2x+7 = 2.29,5 + 7 = 66 derajat (C)
33. A₁ = A₃ = B₁ = B₃ = C₁ = C₃ = 120°
A₂ = 180-120 = 60°
A₂ = A₄ = B₂ = B₄ = C₂ = C₄ = 60°
A₃ + B₄ + C₂ = 120°+60°+60° = 240° (A)