semidarkchoclate semidarkchoclate

21-05-2021
Mathematics

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Please help me with the attachment below

Please help me with the attachment below class=

Respuesta :

21-05-2021

a = 70 (vert. opp. angles)
a+b+90 = 180 (adj. angles on st.line)
70+b+90 = 180
b = 180-90-70
b = 20

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