Question

A
С
120°
ABCD is a four-sided shape but two of the sides cross.
a Explain why the sum of the angles at A, B, C and
D must be less than 360°.
b Find the sum of the angles at A, B, C and D,
giving a reason for
your answer.
D
B​

Answer 1

SORRY BUT YOUR QUESTION IS VERY CLUMSY...SO I CAN'T ANSWER