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Verified answer
Kelas 8 MatematikaBab Garis dan Sudut
∠CBD = 180° - ∠ABD
∠CBD = 180° - 7x
∠CBD + ∠BCD = ∠CDE
180° - 7x + 92° = 9x
272° = 9x + 7x
16x = 272°
x = 272°/16
x = 17°
∠CBD = 180° - 7x
∠CBD = 180° - 7 . 17°
∠CBD = 180° - 119°
∠CBD = 61°