Question

M∠1 = _°

a) 140
b) 160
c) 80

Answer 1

∠1 = 1/2 (220 - 60) = 80°

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Answer: 80°
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Answer 2

Option c
`80\°`

Explanation:

we know that

The measurement of the external angle is the semi-difference of the arcs which comprises

so

in this problem

`m<1=(1)/(2)(220\°-60\°)=80\°`