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About Mrs. Smith
Algebra 2 Period 5,7,8
Geometry Period 1
Geometry Period 3
Famous Mathematician Project
Descriptive Statistics Project
Architect Project
Park Plan Project
Math Dictionary Links
Using the TI graphing calculator
Extra Credit Problems
MCAS Information
Translating Word Problems
compass and protractor
Constructing Bridges
Pythagorean Theorem
Greek - English Alphabet Project
NERRS - Watershed to Estuary
Isaac Asimov
Origami Hearts
STAR Math Testing link to Renaissance Place
Mrs. Smith Sums It Up
compass and protractor

How to use a compass:


A compass is an instrument used to draw circles or the parts of circles called arcs.  It consists of two movable arms hinged together where one arm has a pointed end and the other arm holds a pencil.

Note that a compass is also called a pair of compasses.

To draw a circle (or arc) with a compass:

  • make sure that the hinge at the top of the compass is tightened so that it does not slip
  • tighten the hold for the pencil so it also does not slip
  • align the pencil lead with the compass's needle
  • press down the needle and turn the knob at the top of the compass to draw a circle (or arc)

Example 2

Use a compass to draw a circle of radius 4 cm.

How to Use a Protractor

link to how to

Using a protractor to measure angles
1.   The figure below is an irregular triangle.
  (a) Measure the 3 internal angles with a protractor and add them up.
  (b) Can you draw a circle inside the triangle with your compass so that the circle touches all three sides at one point?

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