In triangle ABC, AB = AC = 15 cm and
BC = 18 cm, find cos angle ABC.
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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 a isosceles triangle ️
if we draw AD A to line BC
it will bisect BC so BD =18 /2 =9 CM
️ABC WILL BE RIGHT ANGLE TRIANGLE
with the base BD - 9 CM &Hypotenuse =AB=15 CM
️ ABD = ️ ABC
= Cos ️ABC = 3/5
= Cos ️ABC = 0.6
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