The ratio of three angles respectively 1:3:5, which is the big angle
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As all the angles of a triangle= 180°. So 1x+3x+5x= 180°. 4x+5x=180°. 9x= 180°. x= 180÷9= 20. So x= 20. 1x= 20*1= 20°. 3x= 20*3= 60°. 5x= 20*5= 100°. So 5 is the biggest angle.
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