Answer:
It depends, but probably yes
Explanation:
Earth is a great example: there are many places on Earth where the climate falls in "0 to 15 degrees Celsius during winter and 25 to 30 degrees Celsius during summer". It also has an atmosphere, so yes, water may be able to exist on such a planet.
But we also have to consider other factors like the thickness of the atmosphere, what it's made of, what the planet's made of, etc. So while water <em>may</em> exist, there are a plethora of other factors to consider.
You can find the measure of any of the three sides, by knowing the measure of one side in the triangle. The hypotenuse is equal to twice the length of the shorter leg, which is the side across from the 30 degree angle.
