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`ABCD` is a rhombus. `AC` is the same length as the rhombus sides.
What is the size of `/_ DCB?`
`90^@` | `100^@` | `110^@` | `120^@` | `130^@` |
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`120^@`
`text(S) text(ince)\ Delta ADC and Delta ABC\ text(are)`
`text(equiangular triangles,)`
`/_ DCA = /_ ACB = 60°`
`:. /_ DCB` | `=60^@ xx 2` |
`=120°` |