Examine the diagram at right.

1. Are the triangles in this diagram similar? Justify your answer using similarity transformations.

   Hint (a):

   Draw $ΔSHR$ and $ΔSAK$ separately. Which angles are congruent?

2. What is the relationship between the lengths $HR$ and $AK$? Between the lengths $SH$ and $SA$? Between the lengths $SH$ and $HA$?

   Hint (b):

   Compare $SR$ with $SK$. How are these lengths related? If the triangles are similar,
   then this relationship will be true for the other pairs of corresponding sides.

   $S K = 20 \text { units and } R H = 8 \text { units, what is } H A ?$

3. If $SK = 20$ units and $RH = 8$ units, what is $HA$?

   Hint (c):

   Add the lengths to your diagram from part (a). If $SK = 20$, how long is $SR$?
   Use the Pythagorean Theorem to calculate the unknown side length.