** it is intended Triangle**** **** ** sdrta.net Topical overview | Geometry outline | MathBits" Teacher sources **Terms that Use contact Person:** Donna Roberts

Use only your compass and also straight edge when drawing a construction. No free-hand drawing! |

We will certainly be doing 3 constructions that an it is provided triangle. The first will it is in to build an it is provided triangle offered the size of one side, and also the various other two will certainly be to construct an it is provided triangle inscriptions in a circle.

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**STEPS:**** 1. place your compass allude on A and measure the street to suggest B. Swing an arc the this size above (or below) the segment. 2. Without an altering the expectancy on the compass, place the compass allude on B and waver the exact same arc, intersecting v the an initial arc. 3. brand the suggest of intersection together the third vertex of the equilateral triangle.**

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See the full circles in ~ work. |

** proof of Construction: **Circle *A* is congruent to circle *B*, since they to be each formed using the very same radius length, *AB*. Since *AB* and also *AC* are lengths the radii of one A, they room equal to one another. Similarly, *AB* and *BC* room radii of circle *B*, and are equal to one another. Therefore, *AB = AC = BC* by substitution (or transitive property). Because congruent segments have equal lengths,

*ABC*is it is provided (having three congruent sides).