How can I draw a perfect check mark?

I’m trying to combine 2 rectangles to make a perfect check mark (a tick). But it always seems to end up looking weird, especially when I mess around with the anchor property. Advice?

EDIT:

Solved:

    <Panel>
        <Rectangle Fill="#000" Width="130" Height="20" Anchor="0%, 100%" X="50%" Y="50%" TransformOrigin="Anchor">
            <Rotation Degrees="-45" />
        </Rectangle>
        <Rectangle Fill="#000" Width="70" Height="20" Anchor="100%, 100%" X="50%" Y="50%" TransformOrigin="Anchor">
            <Rotation Degrees="45" />
        </Rectangle>
    </Panel>

This will make a perfect tick as long as the height on both is the same