MATH
Radius, Diameter, Area and Circumference
![Picture](/uploads/2/5/4/0/25409826/492861593.jpg)
In Math we have learned about radius and diameter of a circle. Radius only goes halfway through the circle and diameter goes right through, splitting the circle in half. The formula for circumference of a circle is 2 (3.14)R. How to find the circumference of a circle is very simple. You find the radius and multiply by 3.14, also known as 'pie'. Then you take the answer and times it by 2. (Example: The radius of a flower pot is 175.84 cm) How to find the area of a circle is pretty similar. Only it's (3.14)R square, not 2 (3.14)R. All you do is multiply 3.14 with the radius. Once you get your answer you add 'square' to your answer. (example: The area of a lock is 78.5 cm square) It's the same formula with diameter but instead of 'R' you put 'D' and it's double. (Example: R=2 D=4)
Area of a Parallelogram
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We also have learned about the area of a parallelogram. The formula is length x width. (Example: A=7 cm B=9 cm. 9x7=63 cm) You can also draw a dotted line done from the left upper corner to the bottom in a straight line.
Area of a Triangle
![Picture](/uploads/2/5/4/0/25409826/496894575.jpg)
Just recently, we learned how to find the area of a triangle. I know it sounds hard, but it's not. The formula is the similar as the previous section's formula, length times width. Except after you're done, you divide it by 2. (Example: 3x4=12...12 divided by 2= 6 cm)
![Picture](/uploads/2/5/4/0/25409826/724442819.png)
In class, we have learned how to find the area of the shaded area. In order to find the area, you must split it into three parts. The first step is to find the area of the circle. Since I have already explained how to find the area, I will not be explaining again. The second step is to find the area of the shaded area. It could be a parallelogram, triangle or a square. The final step is to subtract the two answers that you got from the circle and the shaded area.
(Example: Circle has a radius of 5 m. 3.14 x 5 x 5= 153.50
The square's width is 10 m and the square's length is 22 m. 22 x 10= 220
220.00-153.50= 66.50 m)
(Example: Circle has a radius of 5 m. 3.14 x 5 x 5= 153.50
The square's width is 10 m and the square's length is 22 m. 22 x 10= 220
220.00-153.50= 66.50 m)
Coordinates
![Picture](/uploads/2/5/4/0/25409826/8395382_orig.gif)
In Math, we have been learning about the "y" axis, the "x" axis, coordinates, the 4 quadrants, translating, reflecting and rotating. First, I will talk about coordinates.
Coordinates are the corners of a square, triangle or parallelogram that are on a line that leads to two numbers. One on the "x" axis and one on the "y" axis. The example for this will be on the bottom of this section.
Quadrants are the four sections of the grid. Quadrant 1 is all positive like the picture shows. Quadrant 2 is positive and negative, quadrant 3 is all negative and quadrant 4 is positive and negative. If you are doing a question and you are confused on which one comes first, then think of it like this; a baby must crawl (x) before it walks.(y) So, the "x" axis comes first. If you paid attention to your teacher in elementary, you will already know that the bigger number is on the right and the top. That's why there's the negative and positive sections.
Translating is pretty easy. All you do is move left or right a number of times, then move up or down a number of times. (Example: Move 1, 6 left 3 times and up 2 times. New coordinates? -2, 8)
Reflecting is a little bit harder, but not that hard. All you do is either move the shape over the "y" axis or the "x" axis or even both! (Example 1: Move 3, 8 over the "x" axis. New coordinates? -2, 8)(Example 2: Move 5, 10 over the x axis then the y axis. New coordinates? -5, -10)
Rotating is surprisingly easy! All you do is rotate the shape either clockwise or counterclockwise and rotate it a certain degrees. (Example:90 degrees.) To put it in a more easier manner, imagine a clock. Imagine that it is 12:00 p.m. 90 degrees is 3:00, 180 degrees is 6:00, 270 degrees is 9:00 and 360 degrees is obviously 12:00 a.m.
Coordinates are the corners of a square, triangle or parallelogram that are on a line that leads to two numbers. One on the "x" axis and one on the "y" axis. The example for this will be on the bottom of this section.
Quadrants are the four sections of the grid. Quadrant 1 is all positive like the picture shows. Quadrant 2 is positive and negative, quadrant 3 is all negative and quadrant 4 is positive and negative. If you are doing a question and you are confused on which one comes first, then think of it like this; a baby must crawl (x) before it walks.(y) So, the "x" axis comes first. If you paid attention to your teacher in elementary, you will already know that the bigger number is on the right and the top. That's why there's the negative and positive sections.
Translating is pretty easy. All you do is move left or right a number of times, then move up or down a number of times. (Example: Move 1, 6 left 3 times and up 2 times. New coordinates? -2, 8)
Reflecting is a little bit harder, but not that hard. All you do is either move the shape over the "y" axis or the "x" axis or even both! (Example 1: Move 3, 8 over the "x" axis. New coordinates? -2, 8)(Example 2: Move 5, 10 over the x axis then the y axis. New coordinates? -5, -10)
Rotating is surprisingly easy! All you do is rotate the shape either clockwise or counterclockwise and rotate it a certain degrees. (Example:90 degrees.) To put it in a more easier manner, imagine a clock. Imagine that it is 12:00 p.m. 90 degrees is 3:00, 180 degrees is 6:00, 270 degrees is 9:00 and 360 degrees is obviously 12:00 a.m.
Example of Coordinates
In class, we did an assignment where the students are the teachers, and Mr.Morris is the student. We wrote a coordinate test for Mr.Morris to answer and an answer sheet. Mr.Morris wrote the test either making mistakes on purpose or trying very hard and making mistakes. Mr.Morris' results for my test were 2/8.
Algebra
![Picture](/uploads/2/5/4/0/25409826/517802845.png)
In class, we have been learning about algebra. It's not as complicated as it sounds, or at least not the algebra we're learning. The following paragraphs will be actual pictures of what we're learning and not a joke about algebra. On that note, I hope you found that joke quite humorous!
![Picture](/uploads/2/5/4/0/25409826/378272404.png)
Algebra Equations: Basically the picture to the left explains it all, but I'm still going to explain it just for fun! Actually the reason why I'm explaining how to do this is because there is to much room on this paragraph section, and because we have not learned how to do the first two steps.
Adding
Example: 2y+9=30
Step One: Subtract 10 from "10" and "30", then find out the answer. (For some odd reason, when you subtract 10 from 10, it becomes 0).(Answer is 20)
Step Two: Divide "2" on both "2" and "20". (Answer is 10).
Step Three: Write down the answer. (Final Answer: y=10).
Subtracting
Subtracting is similar to adding. The last two steps on the picture on the left explains it perfectly.
Adding
Example: 2y+9=30
Step One: Subtract 10 from "10" and "30", then find out the answer. (For some odd reason, when you subtract 10 from 10, it becomes 0).(Answer is 20)
Step Two: Divide "2" on both "2" and "20". (Answer is 10).
Step Three: Write down the answer. (Final Answer: y=10).
Subtracting
Subtracting is similar to adding. The last two steps on the picture on the left explains it perfectly.