Answer
21.0 cm wide and 15.9 cm tall.
Work Step by Step
We know, 1 inch = 2.54 cm
Or, $\frac{2.54cm}{1 inch}$= 1
Then, 8.25 inch = 8.25 inch × $\frac{2.54cm}{1 inch}$ = 20.955 cm $\approx$ 21.0 cm
Similarly, 6.25 inch = 6.25 inch × $\frac{2.54cm}{1 inch}$= 15.875 cm $\approx$ 15.9 cm