Structure question 1 doc

Geometry

This section will familiarize you with the properties of angles, lines, polygons, triangles, and circles, as well as the

formulas for area, volume, and perimeter.

Geometry is the study of shapes and the relationships among them. Basic concepts in geometry will be

detailed and applied in this section. The study of geometry always begins with a look at basic vocabulary and con￾cepts. Therefore, a list of definitions and important formulas is provided below.

Geometry Terms

Area the space inside a 2-dimensional figure

Circumference the distance around a circle

Chord a line segment that goes through a circle, with its endpoints on the circle

Congruent lengths, measures of angles, or size of figures are equal

Diameter a chord that goes directly through the center of a circle—the longest line segment that

can be drawn in a circle

Hypotenuse the longest side of a right triangle, always opposite the right angle

Leg either of the two sides of a right triangle that make the right angle

Perimeter the distance around a figure

π (pi) The ratio of any circle’s circumference to its diameter. Pi is an irrational number, but

most of the time it is okay to approximate π with 3.14.

Radius a line segment from the center of a circle to a point on the circle (half of the diameter)

Surface Area the sum of the areas of all of a 3-dimensional figure’s faces

Volume the space inside a 3-dimensional figure

–THEA MATH REVIEW–

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