The remaining sides are both 9 units. A 45-45-90 triangle follows the side ratio of the two shorter sides relating to the hypotenuse in a 1:√2 ratio.
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There is a right triangle with you in the lower left vertice, and the right angle between the sides 50 (vertical segment) and 200 (horizontal segment)
Then, tan (angle of elevation) = vertical / horizontal = 50/200 = 0.25
=> angle = arc tan(0.25) = 14 degress.
Answer: 14 degrees
There are three 20 minutes in an hour so she can travel 3 km in an hour
1 km = 1000m so 3km = 3000m she can walk 3000m in an hour
