using a calculator memory key to find the measure of the third angel in a triangeles what is 21-42?

Answer 1

21-42=-21

if two angles in your trianlge are 21 and 42, the third one is 117

Answer 2

It helps if you can communicate your question intelligibly. I remember being in school and about to take a test in a class other than English and someone would inevitably ask "does spelling count?" Education should be integrated. If I were a teacher, I wouldn't answer yes or no, but simply say "I'm not going to try and guess what you meant. If I don't recognize a word you wrote, I'll assume you made it up and are just trying to BS your way through the answer."
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Now on to your question:

Are we looking for the measure of the third angle in a triangle for which the other two angles are 21 (degrees) and 42 (degrees)?

The sum of the measures of all 3 angles in a triangle is always 180 degrees (in plane geometry).

I suppose this is more an exercise for using a calculator's memory function. It's really pointless. But the keystrokes might go something like this:

21 + 42 = STO 180 - RCL =

where "STO" stores the sum of 21 and 42 in the memory,
"RCL" recalls that value from memory when you're ready to subtract it from 180. Check your calculator for the designations of the store and recall functions.

I say it was pointless for the problem, because to solve the problem all you need do is:
180 - 21 - 42 =
and the answer will be displayed.

Answer 3

I don't understant. Why are the angels in the calculater? And what are triangeles. Is that like tri-angels? 3 angels? I am so confused. And 21-42 is -21

Answer 4

If those are two of the three angles the angle total must be 180 so subtract both of them from 180. If you want you can add the two and store the result in the calculator memory. Then load 180 and hit subtract and recall the memory as the number to subtract. You will get 117.