Geometry Review

Quadrilaterals

What does “Quad” mean?

Quad means 4

How many sides does a quadrilateral have?

A quadrilateral has 4 sides!

These are all quadrilaterals!

Kinds of quadrilaterals – see if you can name them!

p _ _ _ _ _ _ _ _ _ _

parallelogram two sets of parallel sides

r _ _ _ _ _ _ 3 in. 3 in. 3 in. 3 in.

rhombus – all the sides are equal in length

t _ _ _ _ _ _ _ _

trapezoid – only one pair of parallel sides

s _ _ _ _ _

square – has right angles and ALL sides are the same length

r _ _ _ _ _ _ _ _

rectangle

Other important polygons you need to know

PENTAGON Five sides, five angles

Hint: an octopus has 8 legs

Eight sides, eight angles OCTAGON Eight sides, eight angles

Hint: Six has an X – so does the name of this shape.

HEXAGON Six sides, six angles

Points, Lines, and Segments

p _ _ _ _ A

point A

l _ _ _ B C

line B C

l _ _ _ s _ _ _ _ _ _ _ K S

line segment K S

r _ _ S L

ray S L

p _ _ _ _ _ _ _ lines A B C D

parallel lines two lines that will never cross B C D

i _ _ _ _ _ _ _ _ _ _ _ lines X C Y D E F R S

intersecting lines lines that will cross if extended Y D E F R S

p _ _ _ _ _ _ _ _ _ _ _ _ lines F S T G

perpendicular lines lines that cross to form right angles

Angles

o _ _ _ _ _ angle

obtuse angle bigger than a right angle – more than 90 degrees

a _ _ _ _ angles Katie Smith © 2012

acute angles are smaller than a right angle – less than 90 degrees

r _ _ _ _ angles

right angles look like the letter L and are 90 degrees

Perimeter

Think of Jurassic Park: “Secure the Perimeter Think of Jurassic Park: “Secure the Perimeter!” means get the fences ready!

Perimeter = the measurement All the way around an object Perimeter = the measurement All the way around an object *Add all the sides to find the perimeter!* 4 in. 6 in. 3 in.

What is the perimeter of the triangle? 4 in. 6 in. 3 in.

P=13 inches 4 in. 6 in. 3 in.

Area

Area is the measurement inside of an object.

Find the area by multiplying the sides Find the area by multiplying the sides. length x width = l x w What is the area of this rectangle? 7 in. 4 in.

Find the area by multiplying the sides Find the area by multiplying the sides. length x width = l x w What is the area of this rectangle? 7 in. A=28 square inches 7x4=28 4 in.

What is the area of this square?

What is the area of this square? Area=25 square feet 5x5=25 5 ft.

What is the area of this rectangle? 7 in. 3 in. 3 in. 7 in.

What is the area of this rectangle? 7 in. Area=21 square inches 7x3=21 3 in. 3 in. 7 in.

Types of Triangles

Triangles can be named by the lengths of their sides.

e _ _ _ _ _ _ _ _ _ _ triangle 3 in. 3 in. 3 in.

equilateral triangle all the sides are equal in length

Hint: think about an icicle i _ _ _ _ _ _ _ _ triangle Hint: think about an icicle 10 in. 10 in.

isosceles triangle two of the sides are equal 10 in. 10 in.

Hint: think about the scales on a dinosaur s _ _ _ _ _ _ triangle Hint: think about the scales on a dinosaur 4 in. 6 in. 7 in.

scalene triangle none of the sides are the same length 4 in. 6 in. 7 in.

3-D SHAPES

c _ _ _ _ _ _ _

cylinder

c _ _ _

cube

s _ _ _ _ _

sphere

p _ _ _ _ _ _

pyramid

c _ _ _

cone

r _ _ _ _ _ _ _ _ _ _ p _ _ _ _

rectangular prism

t _ _ _ _ _ _ _ _ _ p _ _ _ _

triangular prism

Great job Mathematicians!!!