In triangleabc, c is the right angle. if tana = 8/6, find cosb

a. 6/8
b. 6/10
c. 8/10
d. doesnt exist

Short answer = C) 8/10

Working :

Tan A = 8/6 = Opposite / AdjacentOpposite = 8 units

Adjacent = 6 units

Hypotenuse =

                     =

                     =

                     = 10 units

Cos B  = Adjacent/ Hypotenuse

        ∴  cos B= 8/10

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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the answer is 48m^2!

step-by-step explanation: