The red triangle is an enlargement of the original by a scale
    factor of a. The lengths of its sides are marked on.<br />
    <img height="202" width="356"
    src="/content/01/12/six2/matterofscale4.png" alt="" /><br />
    Can you mark on the lengths of the blue triangle? What can you
    say about the resulting triangle when the two are joined
    together? <br />