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Transcript
Geometry Review: 0011 0010 1010 1101 0001 0100 1011 1 2 4 Basic Concepts of Shapes While the Egyptians and Babylonians demonstrated knowledge about geometry, the Greeks created the first formal mathematics of any kind by organizing geometry with rules of logic. 0011 0010 1010 1101 0001 0100 1011 1 2 4 Click here to learn about more math history. Geometry is a fundamental part of mathematics. The word “geometry” the 0011 0010comes 1010 1101 from 0001 0100 1011Greek words geo meaning “earth” and metrein meaning “to measure.” 1 2 4 Who Uses Geometry? 0011 0010 1010 1101 0001 0100 1011 • • • • • • Architects Astronomers Designers: Aeronautical, Graphics, etc. Surveyors Coast Guard And many many more! 1 2 4 Basic Properties of Shapes 0011 0010 1010 1101 0001 0100 1011 • Polygon - an object with many sides. Ex. Triangle, Rectangle, Pentagon, etc. • All squares are rectangles, but not all rectangles are squares. • Triangles are rectangles cut diagonally in half. • The interior angles of a polygon is 360º. • The interior angles of a triangle is 180º. 1 2 4 Perimeter and Circumference x 0011 0010 1010 1101 0001 0100 1011 x P = Y +Y + X+X =2Y + 2X • The perimeter (P) of a polygon is the sum of the side lengths. • The Circumference (C) is the distance around a circle. C = 2r = d • To the left are some examples. Y r = radius d = diameter Y 1 2 4 Area of an Object 0011 0010 1010 1101 0001 0100 1011 • The area (A) of a rectangle is found by multiplying the length (l) by the height (h). A = l h • The area of a triangle is half of a rectangle. A=½ lh • The area of a circle is A = r2 5 7 A = 75 = 35 5 1 4 2 4 A = ½45 = 10 2 A = 22 = 4 Now Let’s Take The Quiz! 0011 0010 1010 1101 0001 0100 1011 1 2 4 Click here to take the Quiz.