Programming Symbols The following symbols are used to

Programming Symbols The following symbols are used to write flow charts for computer programs. l Which symbols are l polygons? 1 2 Process Manual Operation 5 4 Document 9 Input/Output 3 Online Storage 6 Extract Collate 7 8 Decision 10 Connector Delay

Test #1 – Which symbols are made up of straight line segments only? Test #2 – Does each line segment intersect exactly two other segments, one at each endpoint? Warm-Up l The following shapes are used as weather symbols. Cumulus Cloud Snow Hail Squall Lightning Haze Tropical Storm Altostratus Cloud Showers

Quadrilaterals – Day 1 Polygons

Road Signs What is the meaning of each road sign?

Identifying Polygons l Identify l Why? which figures are not polygons.

Polygons are named by the number of sides: # of Sides 3 4 5 6 7 8 9 10 12 n Polygon Triangle Quadrilateral Pentagon Hexagon Heptagon Octagon Nonagon Decagon Dodecagon n-gon

Example 1: Identify the polygon and state whether it is convex or concave. A. B.

Example 2: Determine whether the polygon is equilateral, equiangular, regular, or none. A. B.

F G 180 o E H Draw a diagonal from vertex G. How many triangles are formed? How many degrees are in a triangle? How many degrees are in the quadrilateral?

Theorem 6. 1: Interior Angles of a Quadrilateral l The sum of the interior angles is 360 o. 4 1 2 3 1 + 2 + 3 + 4 = 360 o.

Example 3: l Find the measures of angles F, G, and H. F G xo E 80 o (x – 20)o xo H

Homework – Day 1