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Please help, which plan should you use to prove that an angle of ABCD is supplementary to both of its consecutive angles?

Please help, which plan should you use to prove that an angle of ABCD is supplementary-example-1
Please help, which plan should you use to prove that an angle of ABCD is supplementary-example-1
Please help, which plan should you use to prove that an angle of ABCD is supplementary-example-2

1 Answer

4 votes
Use angles on straight line add up to 180. Isosceles is all same angle
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User Tammoj
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