Please help me and explain. Will give brainliest

Do 6x8 = 48 Since the 2 areas we were given were 6 and 8

Use the Pythagorean’s theorem A squared plus B squared equals C squared

Both numbers (9.00 and 4.25) have three sig-figs. This means that the final answer will have three sig-figs as well.

Multiply the numbers to get: 9.00*4.25 = 38.25 which rounds to 38.3 because the answer must have three sig-figs. 

The units will be "square inches" or "inches^2" or "in^2". There are various ways to write the units portion.

Overall, the final answer is 38.3 square inches.