Assumptions and Figures 3-B How do you determine what can and cannot be assumed from figures? How do...

Assumptions and Figures 3-B

How do you determine what can and cannot be assumed from figures?

How do you determine what can and cannot be assumed from pictures?

What can you assume?

What can you assume?

What can you assume?

What can you assume?

What can you assume?

What can you assume?

To Assume or Not to Assume… In the figure, do you think

you would be justified in assuming that:

B, C, and E are collinear?

?FCEACB BE ll GD?

D

A

BC

E

F

G

Make a List…

Make a list of rules about what you think you can and cannot assume.

A

BC

E

F

G

What can and cannot be assumedYou May Assume: You May Not Assume

(unless marked):

Things that look straight are straight.

Exact measurements and relative sizes of figures.Points shown on a line are

collinear. Unless planes are drawn, all points shown are coplanar.

Parallel or perpendicular lines.

Relative position of points are accurate.

Congruence

To Assume or Not to Assume…

Point S is between R and T.

Points R,S, and T are collinear.

Point S is the midpoint of RT.

VY<TY

STRS

ZWVR

.anglerightaisZYV

R S TV

W

Y

Z

Try ItDraw and mark one figure that shows all of the

following relationships.

On line m, B is the midpoint of AC.Line n ll m

ABEABD

How do you determine what can and cannot be assumed from figures?

You May Assume: You May Not Assume(unless marked):

Things that look straight are straight.

Exact measurements and relative sizes of figures.Points shown on a line are

collinear. Unless planes are drawn, all points shown are coplanar.

Parallel or perpendicular lines.

Relative position of points are accurate.

Congruence

Assignment 3-3BPage 199, 1-4, 6-12, 17-21

Julian Beever is an English artist who's famous for his art on the pavements of England, France, Germany, USA, Australia and Belgium.