how to make circular icon button flutter code example

Example 1: circular button in flutter

Container(
                      width: 90,
                      height: 90,
                      child: RaisedButton(onPressed: (){
                      },
                        color: Colors.deepOrange,  
                        textColor: Colors.white,
                        shape: CircleBorder(side: BorderSide.none),
                        child: Text('Login',style: TextStyle(
                            fontSize: 20.0
                        ),
                        ),
                      ),
                    )

Example 2: flutter icon button circle

ClipOval(
  child: Material(
    color: Colors.blue, // button color
    child: InkWell(
      splashColor: Colors.red, // inkwell color
      child: SizedBox(width: 56, height: 56, child: Icon(Icons.menu)),
      onTap: () {},
    ),
  ),
)

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C Example