Geometry

What does the 12 inches represent? The RADIUS or the DIAMETER?

It is NOT the area because 'square(sq)' is not in the question.

C = 2 pi r

pi = 3.14

r = 6 units.

Hence

C = 2 X 3.14 X 6

C = 12 x 3.14

C = 37.68 units.

What does 24 cm represent? Is it the RADIUS of CIRCUMFERENCE ? Please clarify.

Use the equations.

Exterior angle(EXT) = 360 / n(no. of sides

Hence

EXT = 360 / 7 = 51.42857143....

Hence

Interior Angle(INT) = 180 - 51.42856143... = 128.5714286....degrees.

is the value for one angle.

For the sum of the interior angles it is 7 x 128.5714286.... = 900 degrees.

-7

-5

A rectangle is a parallelogram, with the opposite sides parallel. However, a rectangle MUST have four (90 degree) right angles.

rectagle

ONE pair of parallel sides would be a trapezium or a trapezoid.

2-dimensional figures with parallel sides are ;-

Square, Rectangle, Parallelogram, Rhombus, Trapezium. , BUT NOT a kite.

NB To correct your English Grammar . It is not 'One or more parallel sides', but 'one pair of parallel sides'. How can one side be parallel if it is not compared to another side.

NO!!!!

A Rhombus is a QUADRILATERAL., but has no right-angles (90 degrees)

A Rectangle is a Quadrilateral , but has four right angles.

The word' rectangle' can be split into 'rect' and 'angle'. 'Rect' means 'right' from its Latin root/base. and Angle.

There are no other names for a Rhombus.

Its characteristics are;-

The four sides are all of equal length

The opposite sides are parallel

The sum of the four angles is 360 degrees.

There are NO right angles.

Casually , it may be thought of as a 'lazy square'.

A Rhombus is a Quadrilateral. Like all quadrilaterals , the sum of the internal angles is always 360 degrees.

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