A small mirror designed for a European telescope has diameter of 7.5 inches. Convert into SI units. Find the area of the mirror correct to 3 significant figures.
+37091 There are 2.54 cm to the inch 7.5 inches x 2.54 cm/inch = 19.05 cm = DIAMETER
Radius = 1/2 Diameter = 9.525 cm
Area = pi x r^2 = pi x (9.525)^2 = 285 cm^2 (three sig fig)
