A triangle can only have 1 right angle of 90 degrees.
1.
The fewest number of right angles in a triangle is zero.
Zero. An equilateral triangle, for example, has no right angles.
a right angleA right angle measures 90 degrees.
Zero, or, if it has to have one, one.
a right triangle has one right angleA triangle with a right angle is a right triangle.
A right-angle is a 90 degree angleA right triangle has one, and a 90-degree angle isone.
The minimum number is zero(0). The maximum number is one (1).
A regular 6 sided hexagon has 6 interior obtuse angles each measuring 120 degrees
Antarctica has the least number of countries with zero. Seven countries currently claim land on Antarctica, although these claims are not recognized and are disputed. They include Argentina, Australia, Chile, France, New Zealand, Norway, and the United Kingdom. In a legal sense, the United States and Russia reserve the right to make claims on Antarctica. Of the populated continents, South America has the fewest countries with twelve.
Iran was the nation that suffered the fewest casualties in WWII numbering only 200 resistance soldiers. The Soviet Union was the nation that suffered the greatest number of casualties in World War II numbering over 23 million.
Right now probably the Baiji River Dolphin. There are some local reports of spotting one or two individuals but a 2006 survey revealed none. So there might be 1 or 2 out there but they are at unrecoverable numbers and thus listed as extinct.