Question

answer the 17th one step by step

Answer 1

hey mate here is urs answer

PQR is a isosceles triangle

QPR = QRP

2( QPR) + PQR = 180
2 ( 20 ) + PQR = 180
PQR = 140

SINCE
$\frac{(n - 2) \times 180}{n} = 140 \\ 140 \: n = 180 \: n \: - 360 \\ 40 \: n = 360 \\ n = 360 \div 40 \\ n \: = 9$
hence the regular polygon formed is nanogon

with 9 equal sides



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