Answer:
Step-by-step explanation:
Using the pythagorean theorem, we have :
8 squared + db squared = cb squared
2 squared + db squared = ab squared
=> 64 + db(squared) = cb(squared)
=> 4 + db (squared) = ab(squared)
minus those 2, we get : 60 = cb(squared) - ab(squared)
We have : CA = 8 + 2 = 10
cb squared + ab squared = 10 squared = 100 (pythagorean)
So, cb squared + ab squared = 100
cb squared - ab squared = 60
=> cb squared = (100+60)/2 = 80, ab squared = 20
2 squared + db squared = 20 squared
db squared = 400 - 4 = 396
db = sqrt(396) = 19.8997487421... (round to 19.9)
Hope this helps :)
