Question

Can a triangle be drawn with the following angle measures? Why or why not? 45°, 55°, 65°?
___________________________________________
Can a triangle be drawn with the following side lengths? Why or why not?
2 cm, 11 cm, 8 cm

Answer 1

@pooja195

Answer 2

to check the first, sum up all of the angles . if it does not give you 180 degrees, then it is not a triangle.

Answer 3

ok

Answer 4

@P0sitr0n thank you

What about the second one?

Answer 5

@pooja195 do you know the answer for the second one?

Can u help me find the answer?

Answer 6

this can be less trivial. you could check if this is a right angle triangle by simply looking if 2^2+8^2=11^2, (but this does not prove that it isnt a triangle just rejects the rigth angle triangle)

Answer 7

@P0sitr0n I dont get it

Answer 8

you can also check if the sum of two sides is always greater than the other side

Answer 9

I dont understand

Answer 10

so you test 2+11 >8 true
2+8> 11 false
this is not a triangle

Answer 11

I dont get it @P0sitr0n

Answer 12

you have to check if the sum of two sides is greater than the third side.
take two sides at a time, sum them up, and check if this number is bigger than the third side
if not, then this is not a triangle

Answer 13

it is the called the pythagorean theorem. the formula is \[a ^{2}+b ^{2}=c ^{2}\]

Answer 14

@P0sitr0n Thanks alot

Answer 15

I finally understand it :)!

Answer 16

Thanks @GretaKnows

Answer 17

oops sorry you already got help. I didn't see the other answers. (my internet connection is slow)

Answer 18

Oh Really? then... do you want to answer another question? @GretaKnows

Answer 19

I think I now the answer but because of my eye vision im not sure

Answer 20

let me post the question

Answer 21

okay :)

Answer 22

Are these two figures congruent? Why or why not?

Answer 23

@GretaKnows

Answer 24

i think that they are cong

Answer 25

congruent*

Answer 26

what do you think? @GretaKnows

Answer 27

hello? @GretaKnows

Answer 28

I think so too. Congruent means that they are the same or identical. these to figures look the same. so yes you are right.

Answer 29

oh really? looks like im right!! yay!! thanks for your help

Answer 30

@GretaKnows

Answer 31

sure! anytime :) good job