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---- = ----
b 7
(90° - (90° - 42°)/4)
a = ---------------------------
2
(90° - 48°/4)
a = -----------------
2
(90° - 12°) 78°
a = --------------- = ----- = 39°
2 2
a 3
---- = ----
b 7
39° 3
----- = ---
b 7
(39°)(7) = 3b
273° = 3b
273°/3 = b
91° = b