Question

To prove p + q + r + s + t = 180

Answer 1

Between it is pentagon

Each angle of pentagon is 108°

.: By linear pair and angle sum property, we get

p+72+72=180°

.:P = 36°

All angles, p=q=r=s=t=36°

P+q+r+s+t=36x5=180°

Hence proved

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