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 equal sides and every angle is a right angle (90Â°) Also opposite sides are parallel. A square also fits the definition of a rectangle (all angles are 90Â°), and a rhombus (all sides are equal length). The Parallelogram. A parallelogram has opposite sides parallel and equal in length.