Basic Geometry Review-Shapes

and Angles

Basic Geometry Review-Shapes

and Angles

Review TopicsReview TopicsSquares

Triangles

Rectangles

Polygons

Obtuse Angle

Acute Angle

Right Angle

Finished?

SquaresSquares•Each one of the sides of a square are equal to each other.

•The angles of the square are 90 degrees each.

•The total angle sum of a square is 360 degrees.

TrianglesTriangles•In a triangle, the sides do not have to be the same length.

•There are four types of triangles: right triangle, isosceles triangle, equilateral triangle, and scalene triangle.

•The angle sum of the triangle has to add up to 180 degrees.

RectanglesRectangles

•Rectangles have opposite sides that are equal, so side A=C and B=D.

•Each one of the angles of a rectangle is 90 degrees.

•The angle sum of a rectangle is 360 degrees.

A C

D

B

PolygonsPolygonsEvery Day Shapes:

Octagon Pentagon

PolygonsPolygonsPolygons are named according to the number of sides that they have. For example: Pentagon, pent=5 sides

1

2

3

4

5

Acute AngleAcute Angle

An angle that is smaller than 90 degrees.

What types of shapes have acute angles?

What types of shapes have acute angles?

Most common: Triangle

In this triangle, all three angles are less than 90 degrees.

Obtuse AngleObtuse Angle

An angle that is larger than 90 degrees.

QuickTime™ and aTIFF (Uncompressed) decompressor

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http://www.misterteacher.com/alphabetgeometry/obtuseangles.html

What type of shapes have obtuse angles?What type of shapes have obtuse angles?

Most common: Triangle

This angle is obtuse because it is larger than 90 degrees.

Right AngleRight Angle

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http://commons.wikimedia.org/wiki/File:Right_angle.svg

An angle that measures 90 degrees.

What types of shapes have right

angles?

What types of shapes have right

angles?

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

www.star-ed.com

Square

Right Triangle

Rectangle

Finished?Finished?You have now successfully

reviewed your basic geometric shapes and angle names!