Question

an
important Questions
If the anges of a triangle are
(3x) ° ,4x+5)and (5x-17)° then
find the value of xo
​

Answer 1

Answer:

16

Step-by-step explanation:

Sum of angles in a triangle is supplementary,

3x + 4x + 5 + 5x - 17 = 180°

3x + 4x + 5x + 5 - 17 = 180°

12x - 12 = 180°

12x = 180 + 12

12x = 192

x = 192 / 12

x = 16

Answer 2

Answer:

$(3x) + (4x + 5) + (5x - 17) - - 180.....(sum \: of \: all \: angles \: of \: a \: triangle \: is \: 180) \\ 3x + 4x + 5 + 5x - 17 - - 180 \\ 12x - 12 - - 180 \\ 12x - - 180 + 12 \\ 12x - - 192 \\ x - - 192 \div 12 \\ x - - 16 \\ \\ 3x - - 3 \times 16 \\ 3x - - 48degree \\ 4x + 5 - - (4 \times 16) + 5 \\ 4x + 5 - - 64 + 5 - - 69degree \\ 5x - 17 - - (5 \times 16) - 17 \\ 5x - 17 - - 80 - 17 - - 63degree$

this sign is - - means to =