We will call our pentagons QUACK and SDRIB. Was that too easy? Here are two shapes that look a little like New England Saltbox houses from Colonial times. So are these ratios the same?Ģ 3 = 2 3 \frac 10 7 . If the ratio of one side and one leg of the left-hand triangle is the same ratio as the corresponding side and leg of the right-hand triangle, they are proportional to each other, so they are similar. The right triangle has 30 cm legs and a 20 cm third side. Notice the left triangle has two legs 15 cm long and a third side, 10 cm long. Recall that the equal sides of an isosceles triangle are called legs. Next, you have to compare corresponding sides to see if they maintain the same ratio. You check and the corresponding angles between legs and third sides are congruent, at 71°. Are they similar? You have to check their interior angles to see if they are the same in both isosceles triangles. Are they similar?īelow are two isosceles triangles, one with sides twice as long as the other. Or like your dog Bailey and the neighborhood dog Buddy.Ĭongruent objects are also similar, but similar objects are not congruent. A shoe box for a size 4 child's shoe may be similar to, but smaller than, a shoe box for a man's size 14 shoe. Two geometric shapes are similar if they have the same shape but are different in size. Our example may sound a bit silly, but in geometry we use transformations all the time to bring two objects near each other, turn them to face the same way, and, if necessary, flip them to see if they are similar. You would have to wake Bailey up and get the two dogs facing the same direction, so you could compare snouts, and ears, and tails. You could bring Bailey and Buddy together.
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