What is the surface?
Before you dive into the formula, first understand what the surface means. Imagine wrapping a gift.
The paper you have to cover for a gift is the surface of the box! This means that all sides and angles are the same.
Children:
Remember: The cube has six faces, all squares. Also, there are six faces, but not all of them are the same size.
There are length, width and height. 10)
= 231 = 62cm²
Tip for children:
Think about all the faces of the box. There are three different facial types, everyone comes twice! It’s completely round and has no edges or corners. CM²
Tips for kids:
Always set the radius first! The bowl has a smooth surface that wraps anywhere.
It has a circular base and curved surface, which is the point at the top. 3.14 3 (3 + 5) = 3.14. 38 = 75.36cms² cylinder?
The cylinder looks like a can or a water bottle. It has two circular bases and curved sides. 14
= 351.68cm²
Tip for children:
Multiply stepwise: first in parentheses, then in radius, finally 2. -hemisphere -hemisphere -hemisphere.
sphere.
Formula:
Surface area = 3 radius²
(including curved parts and flat base)
Example:
Ifs radius = 6 cm:
Surface area = 3 vols = 3 ²3.14. Rse ²
cone Immt (r + l)
cylinder 2 raw (r + h)
where:
l = length
b = BREADTH
° H = Sland
radius
Real life for children
cube: Rubik’s Cube
cuboid: Box, brick mixture.
Children’s Memory Tricks
1.The cube has 6 equal squares, so you can hung it on the face over six faces. 3². Find the surface of the cubic 10 cm with sides.
2. The cube length is = 8 cm, width = 5 cm, height = 3 cm. Find the surface.
3. The ball has a radius = 6 cm. What is the surface?
4. Cone radius = 4 cm, slope height = 7 cm. Find that surface.
5. Find the surface of the cylinder with radius = 3 cm and height = 9 cm.
6. The hemisphere radius is = 5 cm.
What is the surface?
Cube: 6 RAW10²= 6 raw 100 = 600cm²
Cubber: 2 (8 raw 3 + 3 8) = 2 (40 + 15 + 24) = 279 = 158cm²
Colle: 4 3.14²
Cylinder ： 23.1433 2. 9） = 23.14。12 = 226.08cm²
hemisphere ： 33.14 Raw 5² = 3 Roh 3.1425 = 235.5cm²
