b = 2.5
Step-by-step explanation:
→ Utilise Pythagoras theorem
b² = c² - a²
→ Substitute in the numbers
b² = 6.5² - 6²
→ Simplify
b² = 6.25
→ Square root both sides
the answer is 54 sq. ft. i just did this question, on odyssey ware, and it was right. make brainliest.