Let ratio constant be x.
Angles are 4x,5x,5x,8x,9x,9x.
"4x+5x+5x+8x+9x+9x=720"
"40x=720"
"x=18"
"4x=18\u00d74=72"
"5x=18\u00d75=90"
"8x=18\u00d78=144"
"9x=18\u00d79=162"
Thus, angles are 72°,90°,90°,144°,162°,162°.
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