A) \[100{}^\circ \]
B) \[80{}^\circ \]
C) \[110{}^\circ \]
D) \[70{}^\circ \]
Correct Answer: B
Solution :
Let the angle be x then supplementary angle = 180 - x Given \[x=\frac{4}{5}(180-x)\] \[5x=4(180-x)\] \[5x=720\,-4x\] \[5x+4x=720\] \[9x=720\] \[x=\frac{720}{9}={{80}^{\text{o}}}\]You need to login to perform this action.
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