Special Properties, SMB-017

What is the value of `x`? (2 marks)

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`80°`

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`text{Sum of internal angles (formula)}`

`= (n-2) xx 180`

`= 3 xx 180`

`= 540^@`

`:. x`	`= 540-(100 + 130 + 120 + 110)`
	`= 80^@`