A firefighter’s ladder leans 50 feet up against a building and is positioned 50 feet away from the building along the ground. The base of the ladder makes a 45° angle with the ground. Use a calculator to find the decimal approximation for cos T. Round to three decimal places.

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im not sure

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0