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a ladder reaches the top of a 20 foot building. the ladder is 4.5 feet away from the building. how long is the ladder?

a 24.5 feet
b 19.5 feet
c 20.5 feet
d 3.5 feet

Respuesta :

Answer:

C

Step-by-step explanation:

do that with pithagoras:

20² + 4,5² = x²

400 + 20,25 = x²

420,25 = x²

x = [tex]\sqrt{420,25}[/tex]

x ~ 20,5

Letter C: 20,5 feet