Solve for b. b = ✓ [?]
Enter the number
that goes beneath
the radical symbol
9
6
b
3

 The arc mCAD is 288.

Given: DAB and DCB are right angles; BDC = 54°
Required: arc mCAD
Solution:
 (2 x 54°) + (2 x 54°) + (2 x 36°) = 288
 
Note: in getting 36°, deduct 54° and 90° (right angle) from 180° (which is the total degrees inside a triangle)
   = 180° - 54° - 90°
   = 36° - this is the angle CBD or angle ABD