Square

To determine if a deltoid is a square, we need to examine the defining properties of both shapes:

• Square: A square is a quadrilateral with four equal sides and four equal angles of $90^\circ$.
• Deltoid (Kite): A deltoid is a quadrilateral with two distinct pairs of adjacent sides that are equal. It does not necessarily have right angles and does not require opposite sides to be equal.

Upon comparing these definitions, we can see the differences:

• A square requires all sides to be equal and all angles to be $90^\circ$.
• A deltoid, while having two pairs of adjacent equal sides, does not require all sides to be equal, nor does it need to have $90^\circ$ angles.

Given these properties, it is clear that while all squares can be seen as a special type of deltoid (specifically when two adjacent pairs of sides are equal), not all deltoids are squares because they lack the requirement for right angles and equal opposite sides.

Therefore, the answer to the question "Is a deltoid a square?" is No.

To solve this problem, we need to understand the definitions and properties of a parallelogram and a square:

• A parallelogram is a quadrilateral where opposite sides are parallel. This implies that opposite sides are equal in length, but it does not require all sides to be equal or all angles to be right angles.
• A square is a special type of parallelogram and rectangle where all four sides are of equal length, and all four angles are right angles (90 degrees).

With these definitions in mind, let's compare:

A parallelogram, by definition, does not require all sides to be equal or all angles to be right angles. Therefore, not every parallelogram meets the requirements to be a square.

For example, a rectangle is a type of parallelogram where all angles are right angles, but it may not have all equal sides unless it is a square. Similarly, a rhombus is a type of parallelogram with all sides equal but may not have all right angles unless it is a square.

Thus, while a square is indeed a parallelogram (since it fulfills the conditions of having opposite sides equal and parallel), not every parallelogram is a square. Only those parallelograms which have all sides equal and all angles equal to 90 degrees qualify as squares.

This leads us to conclude that the statement "A parallelogram is a square" is false.

Therefore, the correct answer is No.

To determine whether a rhombus is a square, we must understand the properties of each shape.

Definition of a Rhombus:
A rhombus is a quadrilateral with all four sides of equal length. It may have angles that are not right angles.

Definition of a Square:
A square is a quadrilateral with all four sides of equal length and all four angles equal to $90^{\circ}$.

Comparison:

• Both a square and a rhombus have four equal sides.
• A square has $90^{\circ}$ angles, whereas a rhombus does not necessarily have $90^{\circ}$ angles.

Thus, while all squares are rhombuses (because they have equal side lengths), not all rhombuses are squares (because not all rhombuses have right angles).

Therefore, a rhombus is not a square as a general statement.

To solve this problem, we'll identify key properties of a square and a trapezoid:

• Step 1: Define a trapezoid. A trapezoid is a quadrilateral with at least one pair of parallel sides.
• Step 2: Define a square. A square is a quadrilateral with four equal sides and four right angles, characterized by having two pairs of parallel sides.
• Step 3: Compare properties. A square inherently meets the trapezoid's criterion, because it has two pairs of parallel sides. However, the converse is not true—a trapezoid does not necessarily have four equal sides and four right angles.

Now, let's elaborate:
Step 1: A trapezoid (or trapezium in some regions) is defined primarily by having only one pair of parallel sides. This means a trapezoid does not require all sides to be equal or to have right angles.
Step 2: A square, on the other hand, has stricter requirements: all sides must be equal in length and each angle must be a right angle (90 degrees). This ensures that the square also qualifies as a rhombus and a rectangle, given its properties.
Step 3: When we compare the two, while every square can be technically considered a trapezoid (since it fulfills the base condition of having parallel sides), not every trapezoid can be seen as a square because it lacks the requirement for equal sides and right angles.
Therefore, the question of whether a trapezoid is a square can be answered simply by verifying these fundamental geometric characteristics.

With these points in mind, the correct answer is:

No, a trapezoid cannot be classified as a square.

To determine if a square is a trapezoid, we need to understand the definitions of both shapes:

• Definition of a Trapezoid: A trapezoid is a type of quadrilateral that has at least one pair of parallel sides.
• Definition of a Square: A square is a quadrilateral with four equal sides and four right angles, and it has two pairs of parallel sides (opposite sides are parallel).

Since a square has two pairs of parallel sides, it certainly has at least one pair of parallel sides, which satisfies the definition of a trapezoid under the inclusive definition.

Therefore, we conclude that a square is indeed a trapezoid.

The correct answer to the question is: Yes.