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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
are needed to see this picture.
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
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
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!