Chapter 1 Learning Log Definitions

Chapter 1 Learning Log Definitions

These are the terms and definitions you are responsible for from Chapter 1. They are listed in more or less the same order they appeared in the chapter. Be sure you are familiar with all of them before your tests.

Rectanglesare quadrilaterals with four right angles.

Equilateral triangleshave three sides of equal length and three angles of equal measure.

Perimeteris the distance around the exterior of a two-dimensional figure (sum of side lengths).

Areais the number of square units needed to fill up a region of a flat surface.

Slopeis the steepness of a line. m=rise/run Some of you may remember the formula m=(y2-y1)/(x2-x1)

Parallel lineshave equal slopes.

Perpendicular lineshave slopes that are opposite reciprocals. (sign changed, fraction flipped)

Perpendicularlines intersect to form four right angles.

Circular anglehas a measure of 360 degrees.

Straight anglehas a measure of 180 degrees.

Right anglehas a measure of 90 degrees.

Acute anglehas a measure between 0 and 90 degrees.

Obtuse anglehas a measure between 90 and 180 degrees.

Cylinder has circles for its top and bottom base and the side is perpendicular to the bases.

Translationis a transformation that slides an object to a new location.

Reflectionis a transformation that flips a figure over a line of reflection.

Rotationis a transformation that turns a figure about a fixed point.

Prime notationis used to designate the new figure or image.

Isosceles trianglehas at least two sides of equal length. Its base angles will have equal measure.

Midpointis the point in the middle of a line segment.

Polygonis a two-dimensional closed figure made up of straight line segments connected end-to-end.

Regular polygon has all sides the same length and all angles the same measure.

A shape has reflection symmetry if there is a line of reflection so that when the shape is folded, the two sides will match.

A shape hasrotation symmetryif you can turn the shape (less that 360 degrees) and the shape lands on itself.

An object has translation symmetryif you can slide the shape and the object lands on itself. (Doesn’t really work for shapes, but could work for a line or tessellation.)

Scalene trianglehas no sides of equal length.

Venn diagramsare used to classify objects.