Transcript 2-D Figures - 5thgradedrexel

I can draw and label 2-dimensional figures
using angle measures and side lengths.
Tools:

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Protractor
A tool used to
measure angles.
Always measure
from zero!
Ruler
A tool used to
measure length.
Always measure
from zero!
2 Dimensional (2-D) figures

2-D figures are
shapes that can be
drawn on flat paper.

2-D figures are made
up of angles and
sides.
Angles

Angles are the space
between two lines, at
where they meet.

We mark angles with
a semi-circle.

Angles are
measured in
degrees. Ex: 45°
Acute Angles

Acute angles
measure less than
90°.

Think of the A in
Acute as a sharp
point – acute angles
are inside of sharp
corners.
Obtuse Angles

Obtuse angles
measure greater
than 90°.

Think of the O in
Obtuse as a dull
edge. Obtuse
angles are always
inside fat corners.
Right Angles


Right angles are
exactly 90°.
They are sometimes
called square angles.
 We mark them with a
box.
 You will see them when
perpendicular lines
meet.
Sides & Lines

Some shapes have
parallel sides.
 Parallel sides are
always the same
distance apart and will
never meet.

Some shapes have
perpendicular sides.
 Perpendicular sides
meet at 90° (right
angle).
Triangles

Triangles are any
2-D shape that has:
 3 sides
 3 angles.
 Triangle’s angles =
180 degrees.
Quadrilaterals

Quadrilaterals are
shapes with:
 4 sides
 4 angles
 Quadrilaterals
angles = 360
degrees

Squares, rectangles,
rhombuses,
parallelograms, and
trapezoids are all
quadrilaterals.

Think of the qua in
quadrilaterals like
the qua in quarters.
Quad means 4.
Pentagons

Pentagons have:
 5 sides
 5 angles

You can find a
pentagon inside and
around any 5-point
star.

The Pentagon
building in
Washington D.C. is a
famous symbol.
Hexagons

Hexagons are
shapes with:
 6 sides
 6 angles
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Think of the x to
remind you that
hexagon means six.
Octagon

Octagons are
shapes with:
 8 sides
 8 angles

Think of an octopus
to remind you that
octa means eight.