find the unknown angles
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let the angle a equals to 4a and angle b equals to 5b
thus 4a+5b= 180 (linear pair)
let X for both
9x=180
x=20
poor this value in angles
4a=20×4=80°
5b=5×20=100°
thus 4a+5b= 180 (linear pair)
let X for both
9x=180
x=20
poor this value in angles
4a=20×4=80°
5b=5×20=100°
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2
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Hope this helps u
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