In triangle ABC, angle C = – 90 degrees, BC = 1, sinA = 0.2. Find AB.

ABC is a right-angled triangle with angle C equal to 90 degrees, it is also known that BC = 1 and Sin (A) = 0.2.

For the solution, you need to use the sine of angle A, recall that sine is the ratio of the opposite leg to the hypotenuse. In our case, the hypotenuse is AB, and the opposite leg is BC, which is 1. Therefore, the ratio of BC to AB is 0.2. hence, AB = BC / 0.2 = 5,

Answer: AB = 5.

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