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Verified answer
Mapel : MatematikaBab : Sudut
Diketahui :
- ∠BDC = 100°
- ∠CBD = ∠BCD
- ∠ABD = (4x - 4)°
Ditanya :
- Nilai x = .....?
Penyelesaian :
- Besar ∠CBD atau ∠BCD :
(180° - 100°) ÷ 2
= 80° ÷ 2
= 40°
- Nilai x :
(4x - 4)° + 40° = 180°
4x° - 4° + 40° = 180
4x° + 36° = 180°
4x° = 180° - 36°
4x° = 144°
x = 144°/4°
x = 36
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