Special Properties, SMB-012

`ABCD` is a rhombus. `AC` is the same length as the rhombus sides.

What is the size of `/_ DCB?` (2 marks)

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`120^@`

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`Delta ADC and Delta ABC\ text{are equiangular triangles.}`

`/_ DCA = /_ ACB = 60°`

`:. /_ DCB`	`=60 xx 2`
	`=120°`