Answer:
CD < DB < BC.
Explanation:
To evaluate the sides, we have to compare the angles.
The largest angle is opposite to the largest side.
The middle-sized angle is opposite to the middle-sized side.
The smallest angle is opposite to the smallest side.
So, to find the missing angle, we have to know that the sum of the intern angles of a tringle is 180°.
Let x be the missing angle.
Then, x + 63 + 75 = 180°
x = 180 - 75 - 63
x = 42°
Then, we can compare the sides.
42° is the smallest angle. CD is the opposite side to 42°. Then, CD is the smallest side.
63° is the middle-sized angle. DB is the opposite side to 63°. Then, DB is the middle-sized side.
75° is the largest angle. BC is the opposite side to 75°. Then, BC is the largest side.
So,
CD < DB < BC.