Drawing a square layout inside a circle

I am trying to make a relative layout bounded within a circle i.e the relative layout should be like the square shown in the figure below.

I am trying to set width and height of the layout as:

√((diameter)²/2) which is about 70 %

public class SquareLayout extends RelativeLayout {
    public SquareLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int originalWidth = MeasureSpec.getSize(widthMeasureSpec);
        int originalHeight = MeasureSpec.getSize(heightMeasureSpec);
        int required = Math.min(originalWidth, originalHeight) * 7 / 10;

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        setMeasuredDimension(required, required);
    }
}

What I am getting is a rectangular layout instead of square layout:

Can anyone guide me where I am going wrong?

Sample usage:

<RelativeLayout xmlns:android="http://ift.tt/nIICcg"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

    <com.example.widget.SquareLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#F55C5C">

    </com.example.widget.SquareLayout>

</RelativeLayout>