| 1) acute angle |
| 2) altitude |
| 3) circumference |
| 4) complementary angles |
| 5) degrees |
| 6) diagonal |
| 7) equilateral triangle |
| 8) equivalent ratios |
| 9) height |
| 10) hypotenuse |
| 11) isosceles triangle |
| 12) obtuse triangle |
| 13) pentagon |
| 14) perpendicular |
| 15) pi |
| 16) regular polygon |
| 17) right angle |
| 18) right triangle |
| 19) scale |
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