Anonymous

Geometry proof needed!!?

I need an example of a 10-15 step proof for a high school geometry class. I'll need to back it up with theorems and postulates

Update:

I am asking for an example problem! :)

Relevance

I cud only think of a 9 step proof. It's a flow proof:

Given: ▲UVW is isosceles with vertex angle UVW

line YV is the bisector of angle UVW

Prove: YV is the median

1) ▲UVW is isos. with vertex angle UVW → 2) UV ~= VW

3) YV bisects angle UVW → 4) angle 1 ~= angle 2 }*

5) VY ~= VY

→ 6) ▲UVY ~= ▲WVY → 7) UY ~= YW → 8) Y is the midpoint of UW → 9) YV is the median

Theorems/Postulates:

1) Given

2) Definition of isosceles triangle (▲)

3) Given

4) Definition of angle bisector

5) Reflexive Property

6) Side-Angle-Side (SAS)

7) Dei=finition of similar(~=) ▲s

8) Definition of midpoint

9) Definition of median

i kno its hard to understand it when its typed and sry...i dont know how to attach the pic of the diagram...so u'll have to picture it

* ' } ' means that i combined steps 2,4, and 5 to imply step 6

------------------------------- --------------------------

5(4+3) - (65/5)x = 1 -----given

20+15 -(65/5)x = 1-----distrubutive prop. a(b+c) = ab+ac

-20 -20

15- (65/5)x = 1-----subtraction prop. if a = b, then a-c = b-c

+65/5 +65/5

15 - x = 1 + 65/5-----addition prop. if a = b, then a+c = b+c

times by 5 times by 5

75 - 5x = 67----- divistion prop. if a = b, then a/c =b/c

-75 -75

-5x = -10-----subtraction prop. if a = b, then a-c = b-c

/-5 /-5

x = 2-----division prop. if a = b then a/c = b/c

Source(s): hope this helps!! (pretent theres a line down the middle)
• Anonymous

Give the question to answer the problem

Source(s): brain
• CHos3n
Lv 5