sammy12
If the measures of three angles in a triangle are (2x+15)º, (10x – 20)º, and (3x + 2)º, then find the value of 15x – 3. I am getting 180. Is it right ?
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saifoo.khan
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The sum of all the internal angles of a triangle = 180*
sammy12
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(2x+10)+10x-20)+(3x+2)=180
15x-3=180
15x=183
x=183/15=12.2
x=12.2
(15x-3)=15(12.2)-3=180
sammy12
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Is it right
saifoo.khan
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I guess you did a mistake?
2x+15
sammy12
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Please can you check it
saifoo.khan
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it's 2x+15!
math>philosophy
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I got 15x -3 = 180
sammy12
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I wrote wrong here.
but I put the correct numbers
sammy12
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yes I got the same
math>philosophy
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2x + 15 + 10x – 20 + 3x + 2 = 180
saifoo.khan
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x = 12.2 is right!
sammy12
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My textbook saying 90 as a answer