intersection.

Length, Width, Height.

Faces, Corners and sides.

cm x cm x cm = cm^3

cm^3 is also known as 'mL' ( millilitres) or 'c.c' (cubic Centimetres) .

They are different names for the same volume.

The 'Old Childrens Gam' plan.

Have drawing board.

In it place two pins.

Make a loop of string, and place it over the pins. The loop should be slack/loose.

With a pencil , put it inside the string loop , and pull the loop tight.

Keeping the loop tight, move/draw the pencil as a third point inside the tight loop.

If done correctly, you will have a nice smooth ellipse.

To have an elipse of a certain size. Measure the distance between the pins. Then with the looped string, place it over the two pins . Pull it taught against one pin, and in a straight line through other pin, to limit of half the major axis. Then drawe as before.

Hope that helps!!!!!

NB This is child's/boy scout's stuff.

Remember there are 10 mm = 1cm

So in 50mm = 5 cm.

Here is the Table of Metric Linear Measurement.

10 mm = 1 cm

100 cm = 1m

1000 m = 1 km.

It's quite acceptable to call it an 88-agon but what's more important is knowing how to work out its properties.

Being a right- angled triangle apply Pythagoras.

h^2 = a^2 + b^2

Hence

b^(2) = h^2 - a^2

b^(2) = ( h + a)(h - a)

b^2 = (122 + 22)( 122 - 22)

b^2 = 144(100)

b^2 = 14400

b = sqrt(14400) = 120 .

First find the Exterior angle = 360 / n (No. of sides)

Hence

Exterior angle = 360/19 = 18.947... degrees

Hence the Interior Angle is 180 - 18.947... = 161.05263...

Hence for 19 sides.

19 X 161.05263... = 3060 degrees.

The circumference of a circle is the perimeter of the circle for a given diamater.

NO!!! The word 'perpendicular' means that the lines intersect at 90 degrees (right anhles).

The real answer is 29 .

First, find the number of sides for each group of shapes.

1 nonagon: 1 × 9 = 9

4 pentagons: 4 × 5 = 20

Now add to find the total number of sides:

9 + 20 = 29

They have 29 sides in all.

A Triangle has THREE sides. ; not necessarily equal .

However, triangles are then sub-divided into ;-

EQUILATERAL ; All three sides are the same length , and all three angles are 60 degrees.

ISOSCELES ; Two sides are of equal length and two angles are of equal size.

RIGHT-ANGLED ; All three sides can be of different length , or it can be an Isosceles triangles. However, there MUST be ONE RIGHT Angle (90 degrees).

SCALENE ; All three sides are of different length , and all three angles are of different size.

Decagon has 10 sides, and a Hexagon has 6 sides.

decagon has 10sides

pentagon has 5sides

10-5=5

decagon has 5 sides morethan pentagon

decagon has 10sides

octagon has 8sides

decagon have 2sides more than octagon

The interior angles of a regular or irregular polygon with 29 sides add up to 4,860 degrees

OBTUSE

Amgles less that 90 degrees are Acute

Angles between 180 & 360 degrees are Reflex.

What is 'pbr3' ??? If you mean the chemical phosphorus bromide , the formula is 'PBr3'. NOTE the use of Capital letters.

Ther shape is pyrsmidal, similarl to its group analogy ammonia.

If all three sides are 9 inches in length, then it is an EQUILATERAL Triangle.

All the angles are 60 degrees.

An Hemisphere or a Cone.

A hemisphere is a 3-d shape and so does not have a name as a 2-d shape.

2-d sections of a hemisphere can be circles, semicircles, or sections of circles, depending on the inclination of the intersecting plane.

A triangle doesn't have volume.

volume = height x pi x radius^2

350 = 10xpixrxr

r^2 = 350/(10xpi)

r^2 = 11.141

r = 3.337

formula is height x pi x radius^2

9xpix3.25x3.25

= 298.6476

formula is height x pi x radius^2

11xpix4x4

= 552.9203 cm^3