Lesson 1-5Lesson 1-5

Tools of the TradeTools of the Trade

Ohio Content Standards:Ohio Content Standards:• Apply indirect measurement techniques,

tools and formulas, as appropriate, to find perimeter, circumference and area of circles, triangles, quadrilaterals and composite shapes, and to find volume of prisms, cylinders, and pyramids.

• Draw and construct representations of two- and three-dimensional geometric objects using a variety of tools, such as straightedge, compass and technology.

• Construct congruent or similar figures using tools, such as compass, straightedge, and protractor or dynamic geometry software.

Vocabulary:Vocabulary:

Vocabulary:Vocabulary:

• StraightedgeStraightedge::

Vocabulary:Vocabulary:

• StraightedgeStraightedge: an object used to : an object used to draw a straight linedraw a straight line

Vocabulary:Vocabulary:

• CompassCompass::

Vocabulary:Vocabulary:

• CompassCompass: a tool used to draw : a tool used to draw arcs and circlesarcs and circles

Vocabulary:Vocabulary:

• ConstructionsConstructions::

Vocabulary:Vocabulary:

• ConstructionsConstructions: when figures are : when figures are drawn using only a compass and drawn using only a compass and a straightedgea straightedge

Vocabulary:Vocabulary:

• MidpointMidpoint::

Vocabulary:Vocabulary:

• MidpointMidpoint: a point in the middle : a point in the middle of a segmentof a segment

Use a straightedge to determine which of the three segments at the upper left forms a straight line with the segment

at the lower right.

Use a straightedge to determine which of the three segments at the upper left forms a straight line with the segment

at the lower right.

Draw a figure similar to the one Draw a figure similar to the one shown below. Mark a point shown below. Mark a point CC on line on line ll that you judge will create that you judge will create BCBC that is that is

the same length as the same length as ABAB. Then . Then measure to determine how accurate measure to determine how accurate

your guess was.your guess was.

lB

A

Use a compass and Use a compass and straightedge to construct straightedge to construct

a six-sided figure.a six-sided figure.

Assignment:Assignment:

Pgs. 33 - 34 Pgs. 33 - 34 7-11 all, 7-11 all, 15-19 all15-19 all