Download Unit 3 Vocab

Vocabulary Word
Unit 3 Vocabulary
Definition
1. Quadrangle
(Quadrilateral)
A polygon that has four sides.
2. Regular Polygon
A shape with equal sides and
equal angles
3. Protractor
A tool used to measure angles.
4. Angle
A figure formed by two rays or
line segments with a common
endpoint.
5. Adjacent Angle
Angles that are next to each
other and share a common side.
Example
6. Acute Angle
An angle measuring less than
90º
7.
Right Angle
An angle measuring exactly 90 º
8.
Obtuse Angle
An angle measuring greater
than 90 º, but less than 180 º
9.
Reflex Angle
An angle measuring greater
than 180 º, but less than 360 º
10. Parallel
Two lines that remain the same
distance apart and will never
meet.
11. Equilateral Triangle
A triangle in which all three
sides are equal in length.
12. Isosceles Triangle
A triangle in which two sides
are equal in length.
13. Scalene Triangle
A triangle in which zero sides
are equal in length.