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140º = 8x
x = 17.5
Sudut ABD = 40 + 5x
= 40 + 5 (17.5)
= 40 + 87.5
= 127.5
8x=140
x=17,5
sudut abd =40+5x
=40+5(17,5)
=40+87,5
=127,5 (c)