The angles need to be congruent for the two triangles to be similar.
Hope this helps :)
Answer:
a = 4
Step-by-step explanation:
Answer:
arc ? = 255°
Step-by-step explanation:
arc DB = 180° - 75° = 105°
arc ? = 360° - 105° = 255°
Answer:

Step-by-step explanation:

Break it down step by step.
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Answer:
C = 39 pi meters
Step-by-step explanation:
The circumference of a circle is given by
C = 2 * pi * r
C = 2 * pi * 19.5
C = 39 pi meters