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140⁰ = a + 60⁰(exterior angle sum property of triangle)
140⁰-60⁰ = a
a = 80⁰
b + 60⁰ = 180⁰ (linear pair)
b = 180⁰-60⁰
b = 120⁰
using angle sum property of triangle
60⁰ + a + c = 180⁰
60⁰ + 80⁰ + c = 180⁰
140⁰ + c = 180⁰
c = 180⁰-140⁰
c = 40⁰
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