Answer:
∠ CBA = 67°
Step-by-step explanation:
∠ BAD = 90° ( angle in a semicircle )
The sum of the 3 angles in the triangle = 180° , that is
∠ CBA + 90° + 23° = 180°
∠ CBA + 113° = 180° ( subtract 113° from both sides )
