IM Commentary - Illustrative Mathematics
... particular, there is a sequence of rigid motions mapping one triangle to another if and only if these two triangles have congruent corresponding sides and angles. One of the advantages to working with the rigid motion definition of congruence is that it allows relatively quick and clean proofs of th ...
... particular, there is a sequence of rigid motions mapping one triangle to another if and only if these two triangles have congruent corresponding sides and angles. One of the advantages to working with the rigid motion definition of congruence is that it allows relatively quick and clean proofs of th ...
Definitions of Key Geometric Terms
... congruent sides. An equilateral triangle is also equiangular, so it is a regular polygon. • An ISOSCELES triangle has at least two congruent sides. The two congruent sides are called legs, and the third sides is called the base. Base angles are always congruent. • A SCALENE triangle has no congruent ...
... congruent sides. An equilateral triangle is also equiangular, so it is a regular polygon. • An ISOSCELES triangle has at least two congruent sides. The two congruent sides are called legs, and the third sides is called the base. Base angles are always congruent. • A SCALENE triangle has no congruent ...
Technical drawing
Technical drawing, also known as drafting or draughting, is the act and discipline of composing drawings that visually communicate how something functions or is to be constructed.Technical drawing is essential for communicating ideas in industry and engineering.To make the drawings easier to understand, people use familiar symbols, perspectives, units of measurement, notation systems, visual styles, and page layout. Together, such conventions constitute a visual language, and help to ensure that the drawing is unambiguous and relatively easy to understand. These drafting conventions are condensed into internationally accepted standards and specifications that transcend the barrier of language making technical drawings a universal means of communicating complex mechanical concepts.This need for precise communication in the preparation of a functional document distinguishes technical drawing from the expressive drawing of the visual arts. Artistic drawings are subjectively interpreted; their meanings are multiply determined. Technical drawings are understood to have one intended meaning.A drafter, draftsperson, or draughtsman is a person who makes a drawing (technical or expressive). A professional drafter who makes technical drawings is sometimes called a drafting technician. Professional drafting is a desirable and necessary function in the design and manufacture of complex mechanical components and machines. Professional draftspersons bridge the gap between engineers and manufacturers, and contribute experience and technical expertise to the design process.