7. 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.

Masons cell phone company charges $0.12 for every text message he sends plus $2.50 per month if mason sent 25 messages this month how much money does he owe the one with the correct answer and explanation gets 10 points and is marked as the brainliest answer