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Answer:
B +D + C +A = 360⁰
90⁰ + 90⁰ + 100⁰ + A = 360⁰
180⁰ + 100⁰ + A = 360⁰
280⁰ + A = 360⁰
A = 360⁰-280⁰
A = 80⁰
A) 80⁰
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Answer:
80°
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