Which statement is true? a.
All quadrilaterals are rectangles.
b.
All quadrilaterals are squares.
C.
All rectangles are quadrilaterals.
d.
All quadrilaterals are parallelograms.

C. All rectangles are quadrilaterals.

Step-by-step explanation:

A quadrilateral is defined as a closed shape with four sides and angles. Therefore, a rectangle is a quadrilateral. A quadrilateral is the largest group of organization out of everything listed, so C must be correct because it is the only answer to sort a smaller group into a larger one.

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.

if x = 1, then the answer is 3.5