Answer:
Step-by-step explanation:
no. of sides n=5
sum of interior angles=(n-2)×180=(5-2)×180=3×180=540
72+2x+99+89+3x=540
5x+ 260=540
5x=540-260
5x=280
x=56°
x=20
it all adds up to 360°
72+89+99+5x=360
360-260=5x
5x=100
