a = 60⁰
180⁰ - 15⁰ - 45⁰ = 120⁰
180⁰ - 120⁰ = 60⁰
B = 40⁰
180⁰ - 70⁰ - 80⁰ = 30⁰
70⁰ - 30⁰ = 40⁰
y = 30⁰
90⁰ - 60⁰ = 30⁰
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a = 60⁰
180⁰ - 15⁰ - 45⁰ = 120⁰
180⁰ - 120⁰ = 60⁰
B = 40⁰
180⁰ - 70⁰ - 80⁰ = 30⁰
70⁰ - 30⁰ = 40⁰
y = 30⁰
90⁰ - 60⁰ = 30⁰