Answer
The area of $0.50 gry^{2}$ is 0.18 $point^{2}$
Work Step by Step
A gry is measure for length. It's defined as $\frac{1}{10}^{th}$ of a line and line is $\frac{1}{12}^{th}$ of an inch. Whereas a point is $\frac{1}{72}$ inch.
Using the above information, let's try to get direct conversion from gry to point.
1 gry = $\frac{1}{10}$ line = $\frac{1}{10}$ *$\frac{1}{12}$ inch = $\frac{1}{10}$ *$\frac{1}{12}$ *72 point = 0.60 point
Thus,
1 gry = 0.60 point
1 $gry ^{2}$ = 0.36 $point^{2}$
0.50 $gry ^{2}$ = 0.18 $point^{2}$
