The avian cardiovascular system is able to quickly respond to changes in levels of activity (e.g., resting vs. flying) via changes in heart rate, cardiac output, & blood flow (by vasocontriction and vasodilation of vessels).
A square is a quadrilateral with all right angles and all equal sides. A square is also a parallelogram, a rectangle, and a rhombus and has all the properties of all these special quadrilaterals. Figure 3 shows a square. Figure 3 A square has four right angles and four equal sides. Figure 4 summarizes the relationships of these quadrilaterals to one another.
A square has two pairs of parallel lines. This makes it a parallelogram, which is a four-sided polygon with two pairs of parallel sides, each pair being equal in length. A square is a kind of parallelogram whose sides meet at 90 degree angles and are all equal in length. Continue Reading.