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Explanation

Square (regular quadrilateral):

all four sides are of equal length (equilateral), and all four angles are right angles. 

A triangle that has no equal sides and no equal angles is known as a Scalene Triangle

while 

if two sides of a triangle are of equal length, then it is called. Isosceles triangle

Explanation

These are the Seven Wonders of the Modern World

1. The Statue of Liberty, USA
2. Pyramids of Giza, Egypt
3. Stonehenge, England
4. The Parthenon, Greece
5. The Leaning Tower of Pisa, Italy
6. The Eiffel Tower, France
7. The Sydney Opera House, Australia

Explanation

A hexagon is a polygon with 6 sides.

It has 6 angles, one at each vertex.

It also has 6 vertices.

Explanation

The perimeter of a rectangle is the total distance around it.

Formula: Perimeter = 2 × (Length + Width).

Explanation

Acute angles measure less than 90 degrees.

Right angles measure 90 degrees.

Obtuse angles measure more than 90 degrees.

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Explanation

The angle sum of a triangle will always be equal to 180°.

The angle sum of a quadrilateral is equal to 360°

And a triangle can be created by slicing a quadrilateral in half from corner to corner. Since a triangle is essentially half of a quadrilateral

Its angle measures should be half as well. Half of 360° is 180°

Explanation

Hour hand moves 225° (7.5 hours).

Minute hand moves 180° (30 minutes).

Angle between them: 45° (difference) + 30° (hour hand's extra move) = 75°.

OR

= 8h x 30 - 30 x 11/2

= 240 - 165

= 75°

Explanation

The sum of the exterior angles of any polygon is always 360 degrees. 

As for the interior angles, the sum of all the interior angles in a polygon is equal to: (n-2) x 180

Explanation

Two angles are called supplementary when their measures add up to 180 degrees.

Two angles are called complementary when their measures add up to 90 degrees.

Explanation

The formula for the sum of interior angles of a polygon with n sides is 180(n - 2).

It comes from dividing the polygon into (n - 2) triangles, each having 180° total.