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Secondary School?
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Math?
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5 points
In triangle ABC, AB = AC = 15 cm and BC = 18 cm, find cos angle ABC.
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?byAnishkarock?31.07.2017
Answers
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amitnrw?
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Genius
Answer:
In triangle ABC, AB = AC = 15 cm and BC = 18 cm then?Cos?ABC = 0.6
Step-by-step explanation:
AB = AC = 15 cm
BC = 18 cm
it is an isosceles triangle
if we draw AD ? from A to line BC
it will bisect BC so BD = 18/2 = 9 cm
? ABD will be right angle triangle
with Base BD - 9 cm ?& Hypotenuse = AB = 15 cm
?ABD = ?ABC ?( as D is a point on line BC)
Cos?ABC = 9/15
=> Cos?ABC = 3/5
=>?Cos?ABC = 0.6
