Answer:
63 degrees
Step-by-step explanation:
Since this is an isosceles triangle, the two bottom angles must be equal, while the top angle (in the way this specific triangle is oriented) must be different. Therefore, angle CDB is 63 degrees.
∠CDB = 63°
∠CBD and ∠CDB opposite side lengths are congruent (indicated by the little markings)
Because their opposite sides are congruent they are too congruent
So ∠CBD = ∠CDB
because ∠CBD = 63° ∠CDB also equal 63°
