The height of a tree is 10 10 meters long and it grows 1 1 cm in a year. Then its height after one year = 10 10 meters 1 1 cm Its height after 3 3 years = 10 10 meters 3 3 cm Its height after 6 6 years = 10 10 meters 6 6 cm Its height after x x years = 10 10 meters x x cm
Where x x represents an unknown number. From the last line, we can find height of the tree after a certain number of years by taking x x equal to that number. For example, we simply let x=15 x = 15 , 25 25 and 55 55 . Thus, the value of x x depends on our choice. We can give x x any value or number we want. In other words, the value of x x is not fixed, it varies from one situation to the other. Therefore, we call x x a variable whereas 10 10 is a fixed number whole value does not change. So 10 10 therefore is called a constant.
So the answer is A. The way to check if triangles are similar is find the ratio and make sure they are equal. For example if you divide 42 by 27 you get 1.55 And if you do that to all the sides you also get 1.55 so therefore they are similar