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 is a parallelogram with four congruent sides and four right angles. This definition may also be stated as A quadrilateral is a square if and only if it is a rhombus and a rectangle. Proof of Theorem: If a parallelogram is a rhombus, then the diagonals are perpendicular. Rhombus I have all of the properties of the parallelogram PLUS - 4 congruent sides-diagonals bisect angles-diagonals perpendicular. Using the definition, the properties of the rhombus. can be proven true and become theorems. When dealing with a rhombus, the definition and theorems are stated as ...