geometry geometry tools, perimeter, area

• 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

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.

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.

Compass A geometry tool used to draw arcs and circles.

You can use a compass to determine which

segment is longer, AB or CD.

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.

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.

FORMULA An equation that shows how certain quantities

are related.

Parallelogram A quadrilateral with opposite sides parallel.