# PA Chapter 8 Vocabulary Flashcards

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1

Perimeter

The distance around a geometric figure.

2

Area of Rectangle

A = lw

3

Area of Square

A = s2

4

Area of Parallelogram

A = bh

5

Area of Triangle

A = 1/2bh

6

Area of Trapezoid

A = 1/2 (b1 + b2)h

7

Circle

The set of all points in a plane that are the same distance from a given point.

8

Center

The given point from which all points on the circle are the same distance.

9

The distance from the center of the circle to any point on the circle.

10

Diameter

The distance across a circle through its center.

11

Circumference of Circle

C = 2πr or πd

12

Area of Circle

A = π r²

13

Prism

A polyhedron that has two parallel, congruent bases in the shape of polygons.

14

Pyramid

A polyhedron that has a polygon for a base and triangles for sides.

15

Cylinder

A solid that has two parallel, congruent bases (usually circular) connected with a curved side.

16

Cone

A 3-D figure with one circular base. A curved surface connects the base and vertex.

17

Sphere

Three dimensional, geometrical shape, that has all its surface points equidistant from a common point.

18

Face

Any of the individual flat surfaces of a solid object.

19

Edge

For a polygon: A line segment on the boundary joining one vertex (corner point) to another.

20

Vertices

A point at which two polygon edges meet.

21

Cross Section

A view into the inside of something made by cutting through it.

22

Surface Area of Rectangular Prism

SA = 2lw + 2lh + 2wh

23

Surface Area of Cylinder

SA = 2πrh+2πr2

24

Surface Area of Pyramids

SA=B+12ps, where B is the area of the base, p is the perimeter of the base, and s is the slant height.

25

Surface Area of Cones

SA = πr(l+r)

26

Volume of Rectangular Prism

V = lwh

27

Volume of Cylinders

V = πr2h

28

Volume of Pyramids

V=(lwh)/3

29

Volume of Cones

V = (πr2h)/3

30

Volume of Spheres

V = (4/3)πr3

31

Great Circle

The intersection of the sphere and a plane that passes through the center point of the sphere.

32

Hemisphere

Exactly half of a sphere.

33

Similar Figures

Figures that have the same shape but not necessarily the same size.

34

Similar Solids

Solids that have the same shape but not necessarily the same size.