The value of tanA×tanC is 1 because tan is the ratio of the side opposite to the angle to the side adjacent to the angle.
What is trigonometry?
Trigonometry is a branch of mathematics that deals with the relationship between sides and angles of a right-angle triangle.
We have a right angle triangle shown in the figure.
tan is the ratio of the side opposite to the angle to the side adjacent to the angle.
tanA = BC/AB
tanC = AB/BC
tanA×tanC = (BC/AB)×(AB/BC)
tanA×tanC = 1
Thus, the value of tanA×tanC is 1 because tan is the ratio of the side opposite to the angle to the side adjacent to the angle.
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