The area of the aperture of a telescope is given by the formula: $A = \pi r^2$, where $r$ is the radius of the aperture.
For the 10-m Keck telescope, the radius is 5 m, so the area is:
$A_{Keck} = \pi (5)^2 = 25\pi$ square meters.
For the 0.5-m telescope, the
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