Indirect Proof and Triangle Inequality

What assumption would you make to start the indirect proof of ∆ABC≅∆DEF?

• ∆ABC≠∆DEF
• ∆ABC≇∆DEF
• <ABC≠<DEF
• AB≅DE

Tags

CCSS.HSG.SRT.B.5

What assumption would you make to start the indirect proof of AB≅BC?

• AB≠BC
• BA≅CB
• B is the midpoint of AC
• B is the perpendicular bisector oa AC

Tags

CCSS.HSG.CO.C.9

What assumption would you make to start the indirect proof of:
 there can be only one 90 angle in a triangle

• there can be more than one 90 angle in a triangle
• <a+<b+<c=180
• <a+<b+<c≠180
• all the angles in a triangle add up to 180.

Tags

CCSS.8.G.A.5

Which statement is a contradiction of the statement XY≅RT?

• XY<RT
• TR≅YX
• XY≈RT
• XY≤RT

Tags

CCSS.8.G.A.2

Does a triangle with these side lengths exist?
15, 12, 9

• Yes
• No
• I don't know.

Tags

CCSS.7.G.A.2

Does a triangle with these side lengths exist?
33, 16, 17

• Yes
• No
• I don't know.

Tags

CCSS.7.G.A.2

6

• A
• B
• C
• D

Tags

CCSS.HSG.CO.C.10

8

• A
• B
• C
• D

Tags

CCSS.HSG.CO.C.10

11

• Pine, Taylor, Rector
• Rector, Taylor, Pine
• Rector, Pine, Taylor
• Taylor, Pine, Rector

Tags

CCSS.HSG.CO.C.10

Determine whether it is possible to draw a triangle with sides of the given measures. 18cm, 20cm, 40 cm.

• yes
• no

Tags

CCSS.7.G.A.2