The sum of 9 angles of a decagon is 1220°.What is the remaining angles? A) 210° B) 240° C)190° D) 230°
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shduududududueusudusus
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Answer:
Correct option is
A
150
One angle of the decagon = 90
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The number of sides (n)=10
The sum of interior angles =(2n−4) x 90
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Let each of the other angles be equal to x
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9x+90
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=(20−4)×90
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=16×90
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=1440
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9x=1440−90
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=1350
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x=
9
1350
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=150
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Each of the other angles =150
∘
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