Geometry

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Geometry

• Lines and Angles

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LINEA straight path extending in both directions
with no endpoints
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LINE SEGMENTPart of a line, with two endpoints
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RAYA line that has a starting point but no
endpoints
This is an end point
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PARALLEL LINESLines that never cross and are
always the same distance apart.
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INTERSECTING LINESTwo lines that cross each other
Oh my goodness! These lines intersected right
below my feet!
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Angles are measured by

• Degrees!

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NOT those kind of degrees, silly goose!
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Angles are measured by degrees using a protractor.
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Straight AngleA straight angle measures 180
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Right AngleA right angle is an internal angle
which is equal to 90
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How can I remember right angle?
It looks like it is standing upright. Get it?
up-rightRight as in right angle! Hellooo!
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All the angles below are right angles
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Obtuse AngleAn obtuse angle is one which is more
than 90 but less than 180
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All the angles below are obtuse angles
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Acute AnglesAn acute angle is one which is less
than 90
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Awww.. Isnt that a cute little angle? Get it? A
cute acute!!!
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All of these angles are acute angles. Remember to
look carefully at which angle you are being asked
to name. It is the small angle that is less than
90 which is the acute angle.
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Name the angles found in this shape.
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Acute Angles
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Name the angles found in this shape.
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Right Angles
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Name the angles found in this shape.
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obtuse Angles
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Name that angle.
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obtuse Angles
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Name that angle.
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Acute Angles
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Name that angle.
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straight Angle
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Name that angle.
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Right Angle
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Name that angle.
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Acute Angle
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Remember A straight angle measures 180º
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What is the measurement of angle a?
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50

• 180 - 130 50

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What is the measurement of angle b?
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150

• 180 - 30 150

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What is the measurement of angle c?
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70

• 180 - 110 70