Question

plz plz fast class8
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Answer 1

6. let be common ratio x

2( 6x+3x)=90

9x=90/2

x=45/9

x=5

length = 6×5=30

breadth=3×5=15

7.there are 20 diagonal in a octagon

8. let be forth side x

73+73+73+x= 360°

219-x=360°

x=360-219

x=141

forth angle be 141 degree