A triangle has angles 80, (7x -1) and (6x -3) degrees. What is the value of x?
2 Answers
Jan 11, 2018
Explanation:
• " the sum of the 3 angles in a triangle "=180^@
"thus the 3 given angles sum to 180"
rArr80+7x-1+6x-3=180
rArr13x+76=180
"subtract 76 from both sides"
13xcancel(+76)cancel(-76)=180-76
rArr13x=104
"divide both sides by 13"
(cancel(13) x)/cancel(13)=104/13
rArrx=8
rArr7x-1=(7xx8)-1=55
rArr6x-3=(6xx8)-3=45
"the angles are "80^@,55^@" and "45^@
color(blue)"As a check"
80+55+45=180
Jan 11, 2018
Explanation:
Angle sum property of the
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