How to find a ray - ISEE Upper Level (grades 9-12) Quantitative Reasoning

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Question

Which is the greater quantity?

(a) The length of the line segment connecting and

(b) The length of the line segment connecting and

Answer

(a) The length of the line segment connecting and is

$\sqrt{(a -0)^{2}+(b -0)^{2} } = \sqrt{a^{2}+b^{2} }$ .

(b) The length of the line segment connecting and is

$\sqrt{(a -0)^{2}+(0-b)^{2} } = \sqrt{a^{2}+\left ( - b \right ) ^{2} }= \sqrt{a^{2}+b^{2} }$ .

The segments have equal length.

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