Trigonometry: The apparent size of a tall building 2 km away is 0.05 radians. What is the building's approximate height?

the answer was 100 m but I was just wondering how they got 100

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

What are the options?

Ithink the answer is b

Ava is 112 cm  olivia is 89 cm