Geometry geometry tools, perimeter, area

1. •You will learn to use geometry tools.
•You will learn to use a four step plan to solve problems
that involve the perimeter and area of rectangles and
parallelograms
Today’s Objectives
Key Vocabulary
straightedge
compass
construction
midpoint
perimeter
formula
area
Four-step plan

2. straightedge
An object used to draw a
straight line, or to check if a line
is straight. It does NOT have to
be a ruler, just an edge that is
perfectly straight.

3. Determine if the sides of the
triangle are straight.
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.

4. Compass
A geometry tool used to draw arcs and circles.

5. You can use a compass to determine which
segment is longer, AB or CD.

6. In Geometry, you will draw figures using only a compass and a
straightedge. These drawings are called CONSTRUCTIONS. You
do not use any standard measurements when doing a
construction.
This is a construction of a six-sided figure.

7. The center of a line segment is called its MIDPOINT.
You can use thin paper (patty paper) to find
the midpoint of a line segment.

8. FORMULA
An equation that shows how certain quantities
are related.

11. Parallelogram
A quadrilateral with opposite sides parallel.