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1. Inch to Millimeter Conversion
Multiply inches by 25.4
2. Acute Angle
An angle of less than 90°
3. Arc
Any portion of the circumference of a circle.
4. Chord
Any straight line whose opposite ends terminate on thecircumference of a circle
5. Complementary Angles
Two angles whose sum is 90°
6. Diameter
The distance across a circle passing through its center
7. Equilateral Triangle
A triangle with three equal sides and threeequal angles
8. Isosceles Triangle
A triangle with two equal sides and two equalangles
9. Major axis
The long axis of an ellipse
10. Minor Axis
The short axis of an ellipse
The distance from the center point of a circle to theoutside circumference
12. Obtuse Angle
An angle greater than 90°
13. Right Triangle (angle)
A triangle with one 90° angle
14. Supplementary Angles
Two angles whose sum is 180°
15. Circumscribed
A figure bounding so as to touch in as manyplaces possible
16. Inscribed
A figure encircled so as to touch in as many placespossible
17. Perpendicular
At 90° to a given plane or line
18. Symmetrical
A quality in which all the features on either side ofa point, line or a plane are identical
19. Fraction
A part of a whole, such as ½ or ¼
20. Half scale
1:2
21. Double Size
2:1
22. Draw to scale
Drawing an object to a set proportion such as ½, ¼or double its actual size
23. Metric System
A decimal system of weights and measures basedon the meter and the kilogram
24. Bevel
A slanted surface not at 90° to another surface
25. Chamfer
A beveled corner at the opening of a hole or the end ofa cylindrical part to eliminate sharp edges
26. Fillet
An interior corner found on cast, forged or molded parts
27. Knurl
A diamond shaped or parallel pattern cut into cylindricalsurfaced to improve gripping or bonding between parts
28. Round
An exterior corner found on cast, forged or molded parts
29. Parallel Lines
Lines that are equidistant/non-intersecting
30. Skew Lines
Lines that are non-intersecting, non-parallel in 3-Dspace
A plane figure bounded by four straight sides
32. Trapezoid
Two sides parallel
33. Ellipse
A foreshortened circle having a major and a minor axis
34. Bisect
To divide into two equal parts