1.11. Triangle Classification http://www.ck12.org
Answers:
- Start by counting the smallest triangles, 16. Now count the triangles that are formed by four of the smaller
triangles.
There are a total of seven triangles of this size, including the inverted one in the center of the diagram.Next, count
the triangles that are formed by nine of the smaller triangles. There are three of this size. And finally, there is one
triangle formed by the 16 smaller triangles. Adding these numbers together, we get 16+ 7 + 3 + 1 =27.
- This triangle has a right angle and no sides are marked congruent. So, it is a right scalene triangle.
- This triangle has an angle bigger than 90◦and two sides that are marked congruent. So, it is an obtuse isosceles
triangle.
Interactive Practice
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For questions 1-5, classify each triangle by its sides and by its angles.