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Step-by-step explanation:
The sum of all the interior angles of a pentagon is 540°.
Therefore,
a+(a+10)+(a+20)+(a+30)+(a+40) = 540°
a+a+10+a+20+a+30+a+40 = 540°
5a+100° = 540°
5a = 540°- 100°
5a = 440°
a = 440°/5
a = 88°
The largest angle will be -
(a + 40°) = 88° + 40°
= 128°.
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Answer:128
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