The radius of the base surface of a cylinder is two centimeters, the height is 7 centimeters, and th

Surface area = side area + 2 base areas.

Base area s= r

Its outer ring side area can be seen as a rectangle.

Side area = bottom circumference * height = 2 rh

2 r +2 rh = 2 2 2 square centimeters.

Cylinder. Cylinder side area = bottom circumference height (base perimeter knows, the circumference of the circle (2 r) or (d)).

The surface area of the cylinder = 2 base areas + 1 side area (the base area knows, the area of the circle (r r) or (d 2) (d 2) (don't forget to ask for 2, because there are 2 base areas!) ））

The volume of the cylinder = the base area height (sh) (this should be understood!) )

The base area of the cylinder = the area of the circle (r r) or (d 2) (d 2)).

Cone. Surface area may not learn!

Base area = area of the circle (r r) or (d 2) (d 2) (d 2) (it has only one bottom side!) ）

Volume = 1 3 The volume of a cylinder of equal height with its base = 1 3 The base area of the height = 1 3sh (the volume of the cone is equal to 1 3 of the volume of the cylinder of the same height as it).

Explanation: "pài) is an infinite non-cyclic decimal = to keep 2 decimal places, take.

r" is the radius of the circle, "d" is the diameter of the circle, in the same circle or equal circle, r is 1 2 of d, d is 2 times r, "s" is the area, and "h" is the height. The sum of the areas of all the faces of an object is called its surface area. The amount of space occupied by an object is called the volume of the object.

The volume of a cone is equal to the volume of a cylinder of equal height to its base 1 3, and the volume of a cylinder is equal to the volume of a cone of equal height to its base and height is equal to 3 times the volume of a cone.

Provide: I have a number of offers related to this when calculating the circumference of a circle and the area of a circle or the circumference of the base and the base area.

The circumference of the circle or the circumference of the base.

The area or base area of the circle.

Question: You should know a lot, do the questions I gave you!

1.A cylinder, r is 20cm, h is 30cm, find the surface area and volume.

2.For a cone, d is 10cm and h is 20, find the base area and volume.

Do it yourself and see yo!

The bottom area of the cylinder is 2*2*cm².

The area of the cylindrical side is 2*2*square centimeters.

So the cylindrical surface area is 2*cm².

I saw a lot of top students asking questions, but I found that I couldn't understand at all....I finally found a solution ... The result is already settled.

square centimeters) slag years;

A: Its anterior surface area is a large square centimeter

Surface area. 2 Base area + side area.

Square Jane Brother Liang centimeters.

volume dust. The bottom blocking area is high.

Cubic centimetre.

Base area: 2 2 square centimeters.

Height: cm.

The height of this cylinder is: cm).

The height of this cylinder is: cm).

Since the radius and height of the base of the cylinder are known, its side area is 2 RH = 2 square centimeters.

The surface area is 942+2 square centimeters.

Solution: Side area = 2

Surface area = is what is sought.

Side area: 25 2

942 (square centimeters).

Surface area: 4867 (square centimeters).

The radius of the bottom surface is six centimeters, and the height of the cylindrical Zena family is three centimeters, and its area is square centimeters.

Base area s = r = square centimeters.

Side area = ch = 2 square centimeters.

So the surface area s = 2s bottom + s side = 2 square centimeters.

With you, when will I give my aunt and uncle sewing machines are good-looking and convenient, but there are many embarrassing Vaticans.

The diameter is 6cm, the bottom area is 3 = 9, 2 bottoms are 18 in total, the bottom circumference is 6, the height is 6cm, the side area is 36, a total of 54 cm surface area.

The volume is the base area of the height 9 6=54