<p>Section 9, problem 12 can also be done using similar triangles. You have a common angle. You also have the two sides that include the angle having a common proportion of 1:2 = short:long. By SAS, the two triangles are similar.</p>
<p>Section 9, problem 12 can also be done using similar triangles. You have a common angle. You also have the two sides that include the angle having a common proportion of 1:2 = short:long. By SAS, the two triangles are similar.</p>