## Question

###### General right angle trig: if cos(theta) = 2/5, find the value of tan(theta) i did pythagoren theroy a^2 + b^2 = c^2 2^2 + b^2 = 5^2 4 + b^2 = 25 b^2 = square root of 21 how do you simplify the square root of 21

general right angle trig: if cos(theta) = 2/5, find the value of tan(theta)

i did pythagoren theroy

a^2 + b^2 = c^2

2^2 + b^2 = 5^2

4 + b^2 = 25

b^2 = square root of 21

how do you simplify the square root of 21? like what is it simplified?

i did pythagoren theroy

a^2 + b^2 = c^2

2^2 + b^2 = 5^2

4 + b^2 = 25

b^2 = square root of 21

how do you simplify the square root of 21? like what is it simplified?

## Answers

you did the hard part. Get a syentific calculator that does square roots, trig, exponents, logs etc. they are relatively inexpensive. sqrt(21)=4.58258... tan=2/4.58258...=.436436... Ed

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