You regroup because the 4 in 64 plus the 3 in 43 equals 7, then you move onto the tens place, and 60 plus 40 equals 100, so that is how. Your answer is 107.
It's called a rectangle. This is just a definition, so there is not much to explain.
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The second/below one is where point G in an orthocenter
Step-by-step explanation:
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I don't get what you are trying to say I think you need to put it in better understanding
