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Answer:
1) complete angle is 360⁰
then ,
complete angle = interior angle + exterior angle
360⁰ = interior angle + 70⁰
interior angle = 360⁰-70⁰ = 290⁰
2) 8 sides
3) let l = 3x, b= x
x = 5
l = 3×5= 15 , b = 5
perimeter = 2(l+b)
= 2(15+5)
= 2× 20
= 40
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