acute

(x/360*pi*r^2

shortest, longest

(a+b)^2 is greater.

The angles on opposite sides of the X intersection are equal (and supplementary on the same side).

The last three digits are divisible by 8.

The sum of any two sides is greater than the third side.

sqrt(3)/2

(distance)/(rate) d/r

distance=rate×time or d=rt