### Geometry

Talking about Geometry, in Math class this round we have learned geometry. There are two things we learned which are area and perimeter. We have done a lot of exercise in workbook especially about area and perimeter. Area is the measurement inside the shape and perimeter is the measurement outside of the shape. Different kind of shapes have different formulas (formulas are below). At last, I am joyful with the lesson.

### Ratio

Ratio is the comparison between two things or more than that also possible. Ratio can use with fraction and whole number. For instance you want to compare 4 oranges to 5 apples. It will be 4:5. In ratio we use the word “to” for comparing two things. As we can see the instance above said they compare 4 oranges to 5 apples so we use this “**:**” instead of to. Just to add on, if the numbers are big we can simplify it. For another example is, compare 10 books to 5 pencils. That is 10:5. In this case we can simplify it to 2:1 because we take 10 divided by 5 and 5 divided by 5. Despite we simplify it, still it has the same value.

After learning about ratio, I realize that we can use ratio to make life much better. Whenever we want to compare two or three things or more than that, quick thing is ratio is our choice.

### Surface area

This is also a part of the lesson we learn. Surface area is the sum of all areas of all faces. For demonstrate regular prism has 6 faces. To find surface area we will find area of each 6 shapes and plus together. Sometimes we need a little long time to figure out the surface area because we need to know the area of all 6 faces but we only need to find 3 faces area because 3 more faces will have equal area. Then we can take the 3 faces area times two and we will find surface area.