Geometry Review Quadrilaterals What does Quad mean Quad

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!

parallelogram two sets of parallel sides

r______ 3 in. 3 i n. 3 in.

rhombus – all the sides are equal in length 3 in. 3 i n. 3 in.

trapezoid – only one pair of parallel sides

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

rectangle

Other important polygons you need to know

PENTAGON Five sides, five angles

o______ Hint: an octopus has 8 legs

OCTAGON Eight sides, eight angles

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

HEXAGON Six sides, six angles

Points, Lines, and Segments

point A

l___ B C

line B C

line segment K S

r__ L S

ray L S

p _ _ _ _ lines A B C D

parallel lines two lines that will never cross A B C D

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

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

p _ _ _ lines T G F S

perpendicular lines that cross to form right angles T G F S

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!” means get the fences ready!

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

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

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

Area

Area is the measurement inside of an object.

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

What is the area of this square? 5 ft.

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

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

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

Types of Triangles

Triangles can be named by the lengths of their sides.

n. 3 i 3 i n. e _ _ _ _ _ triangle 3 in.

n. 3 i 3 i n. equilateral triangle all the sides are equal in length 3 in.

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

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

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

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

3 -D SHAPES

cylinder

cube

sphere

pyramid

cone

rectangular prism

triangular prism

Great job Mathematicians!!!