Question

Can someone tell me how you do this

Answer 1

the sum of the angles for each triangle is 180 . right ?;)

Answer 2

yes

Answer 3

so we should have :
a+b+c=180
right ?
and :
a=2x-9
b=2x+4
c=x
Now write it again and find an equation for this ;)

Answer 4

im sorry but im still really confused

Answer 5

Look at this example :
a=2
s=8
d=5
a+s+d = ?
we say :
a+s+d = ?
2+8+5= 15
?=15
So we have :
180 = a + b + c
180 = 2x-9+ 2x+4 + x
right ?;)

Answer 6

Now write 2x-9+2x+4+x simply ;)
What do you have ?

Answer 7

we have :
2x-9+2x+4+x=180
2x+4x=180+9-4
7x=185
x=185/7
x=25
Ok ?!;)

Answer 8

ok..

Answer 9

Got it ?

Answer 10

i think so.

Answer 11

a=3x+10
b=x+40
c=x
?

Answer 12

i give up :(
im to stupid for geometry

Answer 13

a+b+c=180

Answer 14

3x-10+x+40+x=180?

Answer 15

i figured it out. Thank you for your help :)