Question

Find the angle subtended at the origin by the line segment whose end points are (0,100) and (10,0)

Answer 1

$\sqrt{(10 - 0) {}^{2} + (0 - 100) {}^{2} }$
$\sqrt{(10) {}^{2} + ( - 100) {}^{2} }$
$\sqrt{100 + 1000}$
$\sqrt{1100}$
$10 \sqrt{11}$