Use the words in the box to complete these sentences:

1. A _________________ is a closed, three-sided plane figure.
2. A triangle with three acute angles is an _________________________.
3. The __________________________ is the line that runs perpendicular from a triangle's vertex to the opposite side of the triangle.
4. A triangle with one right angle is a _________________________.
5. A ___________________________ is a triangle that has no two sides of equal length and no two angles of equal measure.
6. A triangle all of whose sides are equal is an ______________________.
7. We can think of the _________________________ as the side of the triangle on which it "sits." It's the side of the triangle that is perpendicular to the height.
8. The three angles of any triangle always add up to ___________.
9. The ___________________ is the side of a right triangle opposite the right angle.
10. An ________________________ has two sides of equal length and two angles of equal measure.
11. An __________________________ has one obtuse angle.
12. The ____________ of a right triangle are the two sides that actually form the right angle.
13. In a right triangle, the square of the hypotenuse is equal to the squares of the other two legs. We call this idea the ____________________________________.

 




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