Tolong dijawab pakai cara ya…
Jawaban:
mencari X =
sudut ABC = sudut ABE + sudut DBE + sudut CBD
180 = ( 2x-1 ) + 60° + ( 3x+6 )
120 = 5x+5
115 = 5x
23 = x
sudut CBD =
3x+6=3(23)+6=69+6=75 (D)
Jawab:
D. 72°
Penjelasan dengan langkah-langkah:
∠ABC = 180°
180° = (2x – 1)° + 60° + (3x + 6)°
= (- 1 + 60 + 6)° + (2x + 3x)°
= 65° + 5x°
180° – 65° = 5x°
115° = 5x°
= x°
23° = x°
∠CBD = 3x° + 6°
= (3 × 23)° + 6°
= 69° + 6°
= 75°