1.0 video Lesson 29 Estimating 960 540 iPlayerHD https://iplayerhd.com <iframe src="//iplayerhd.com/player/video/6ff3a38d-e5ab-4d09-a47a-696baa60d22c?cbartype=over" allowtransparency="true" frameborder="0" scrolling="no" allowfullscreen mozallowfullscreen webkitallowfullscreen oallowfullscreen msallowfullscreen width="960" height="540"></iframe>