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Mathematics 9 Online
Comerpickles:

http://prntscr.com/hso3p2 Question 1 options: 42 8 96 90

Comerpickles:

@dude

dude:

If B and C are congruent, you can set them equal to each other

Comerpickles:

How do I do that?

dude:

\[4x+10=x+34\]

Comerpickles:

Do I multiply or something?

Comerpickles:

x=8

Comerpickles:

I think thats how ya do it, simplify both sides

dude:

Yep, now substitute 8 back into each equation

Comerpickles:

Which would be A=8, right?

dude:

No, we only solved for x

Comerpickles:

Oh, how do I substitute again?

dude:

For angle B, you would say \[4x+10:~~x=8\\ 4(8)+10\\ 4*8+10\\ =42\]

dude:

Try doing that with C (you should get the same answer)

Comerpickles:

Ohh

Comerpickles:

42

Comerpickles:

Yep

dude:

Show the steps though, too see if you understand

Comerpickles:

Well, not much to it but evaluating, 8+34 = 42

Comerpickles:

Because its (x+34)

dude:

yeh, now what is the sum of the interior angles of a triangle?

Comerpickles:

180

Comerpickles:

I think its that whether its regular or irregular

dude:

Yup, so set the measure of all angles equal to 180 \[42+42+a=180\] Solve for a! That should be your answer!

Comerpickles:

96

dude:

Yep!

Comerpickles:

Wow, geometry is so perplexing, its like Add this, subtract that, Add this, Divide that, then subtract again, its easy.

dude:

Ya lolol

Comerpickles:

I might need help with some more, but I'll let you know in the future

Comerpickles:

Maybe inna few min

dude:

kk

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