Write the Word or Phrase That Best Completes Each Statement $y = x ^ { 2 }$

Short Answer

Write the word or phrase that best completes each statement or answers the question.
-A right triangle has one vertex on the graph of $y = x ^ { 2 }$ at $( x , y )$ , another at the origin, and the third on the (positive) $y$ -axis at $( 0 , y )$ . Express the area A of the triangle as a function of $x$ .