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7M Unit 4 Vocabulary

geometry terms

TermDefinition
Adjacent Angles angles in the same plane that have a common vertex and a common side
Area of a Circle the number of square units needed to cover the surface of a circle
Circumference the distance around a circle
Composite Figures a figure made up of simple geometric shapes
Congruent having the same size and shape; ≅
Cross-section the intersection of a three-dimensional figure and a plane
Diameter a line segment that passes through the center of a circle and has endpoints on each side of the circle
Irregular Polygon two-dimensional, straight-sided figures that do not have equal sides nor angles
Parallel Lines lines in a plane that do not intersect; ∥
Pi the ratio of the circumference of a circle to the length of its diameter; 𝛑 ≈ 3.14 or 22/7
Radius a line segment with one endpoint at the center of a circle and the other endpoint on the circle
Regular Polygon a polygon with congruent sides and angles
Right Rectangular Prism a three-dimensional solid that has six rectangular faces and all right angles
Supplementary Angles two angles whose measures have a sum of 180°
Surface Area the sum of the areas of the faces of a three-dimensional figure
Vertical Angles a pair of opposite congruent angles formed by intersecting lines.
Complementary Angles two angles whose measures have a sum of 90°
 

 



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