If the sum of all the internal angles of a multilateral row and an external angle is 1000 degrees, then how many degrees is the external angle? How many sides is this row? Another question: the sides Ba and BC of the angle ABC are perpendicular to the sides ed and EF of the angle def, the perpendicular feet are m and N respectively, and the angle ABC = 60 degrees?

If the sum of all the internal angles of a multilateral row and an external angle is 1000 degrees, then how many degrees is the external angle? How many sides is this row? Another question: the sides Ba and BC of the angle ABC are perpendicular to the sides ed and EF of the angle def, the perpendicular feet are m and N respectively, and the angle ABC = 60 degrees?

1. There are n sides. The outer corner is a
（n-2）180+a=1000
（n-2）180=5*180+100-a
a=100
（n-2）180=5*180
n=7
2. The angle DEF is 120

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