Post on 14-Feb-2016
description
Notes on Geometry
AcuteAngles
An angle that is less than 90 degrees.Angles
RightAngles
An angle that equals 90 degrees.Angles
ObtuseAngles
An Angle that is more than 90 degrees.Angles
Straight anglesAngles
An angle that equals 180 degrees.Angles
ComplementaryAngles
Two angles that add up to 90 degrees.Angles
supplementaryAngles
Two angles that measure up to 180 degrees.Angles
parallelAngles
Two lines that never touch.Angles
Corresponding anglesAngles
Are equal! They are the matching angles when a parallel line is crossed with a third line. (so, for example, angle 1 and angle 2 are corresponding angles.)Angles
1
2
How many degrees are in a triangle?Triangles
180 degrees in every triangle.Triangles
isoscelesTriangles
A triangle with two equal sides.Triangles
equilateralTriangles
All the sides are equal.Triangles
scaleneTriangles
No sides are equalTriangle
rightTriangles
A triangle with one right angle.Triangles
ObtuseTriangles
A triangle with one obtuse angle.Triangles
acuteTriangles
A triangle with all angles that are acute.Triangles
PolygonShapes
A shape with all straight sides.Shapes
Regular PolygonShapes
All equal angles and all equal sides.Shapes
QuadrilateralShapes
Shape with 4 sidesShapes
PentagonShapes
A shape with five sidesShapes
HexagonShapes
A shape with six sides.Shapes
HeptagonShapes
A shape with seven sides.Shapes
OctagonShapes
A shape with eight sides.Shapes
NonagonShapes
A shape with nine sides.Shapes
DecagonShapes
A shape with ten sides.Shapes
ParallelogramShapes
A quadrilateral with two sets of parallel sides.
TrapezoidShapes
A quadrilateral with only ONE set of parallel sides.
RectangleShapes
A parallelogram with 90 degree angles.Shapes
SquareShapes
A rectangle with all equal sides. (90 degree angles).
Area of a parallelogramShapes
Base * heightShapes
Area of a triangleShapes
½ base*height
Area of a circleShapes
A = pi*r-squaredShapes
CircumferenceShapes
Perimeter of a circleC=diameter * piShapes