# Let the vertex of

In ΔAOD and ΔCOE,

Therefore,

By SSS congruence,

ΔAOD ΔCOE

∠OAD = ∠ OCE (By CPCT) (i)

∠ODA = ∠OEC (By CPCT) (ii)

Using (i), (ii) and (iii), we get

∠OAD = ∠OCE = ∠ODA = ∠OEC = x

Now,

In triangle ODE,

OD = OE

a + x + x + y = 180o

2x + a + y = 180o (iv)

∠DOE = 180o – 2y

And,

∠COA = 180o - 2a

∠DOE - ∠COA = 2a – 2y

= 2a – 2 (180o - 2x – a)

= 4a + 4x – 360o (v)

∠BAC = 180o – (a + x)

And

∠ACB = 180 – (a - x)

In ΔABC,

∠ABC + ∠BAC + ∠ACB = 180o (Angle sum property of triangle)

∠ABC = 2a + 2x – 180o

∠ABC = 1/2 (4a + ax – 3600) [using (v)]

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