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3 years ago

WHAT ON EARTH IS THIS ANSWER

Mathematics

1 answer:

olga_2 [115]3 years ago

5 0

Answer:

Step-by-step explanation:

You can figure out the angle DBC by the alternate interior theorem. Angle DBC=56 degrees. You already figured out BD.

Since we know BD, BC, and the angle DBC we can use the Law of cosine to find CD

The law of cosine is

CD^2=BC^2+BD^2-2(BC)(BD)cos DBC

Plug in what we know

CD^2=18^2+12.1^2-2(18)(12.1)cos 56

CD^2≈228.8387

Find the square root to isolate CD.

CD≈15.1

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