Though it experiences freezing temperatures, much of antarctica is considered a desert because it shares a key quality in common with other deserts: like all deserts, it has
a. flora and fauna in common with the sahara
b. extreme temperatures that make settlement difficult
c. large ice caps and ice sheets
d. an average of less than 10 inches of precipitation per year

Antarctica would have flora and fauna very different from Sahara - so we can exclude this option. Also, Sahara doesn't have ice sheets - so we can exclude option c too.

The correct answer is d- deserts are usually defined in their relatively low level of precipitation.

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In a right-angled triangle: 1- the hypotenuse is the longest side2- we can apply pythagorean rule which states that: (hypotenuse)^2 = (side1)^2 + (side2)^2for the given triangle,longest side is 15 cm  side1 = 9 cmside2 is 12 cm  to check whether the triangle is right-angled or not,compare (15)^2 to the summation of (9)^2 and (12)^in other words, compare 225 to the summation of 81 and 144if they are both equal, then the triangle is right-angles, otherwise, it is not.you haven't provided the diagram showing her work, so i cannot tell the choice. however, apply my explanation to the question you have.