解:设∠A=x,∵AP1=P1P2=P2P3=…=P13P14=P14A,∴∠A=∠AP2P1=∠AP13P14=x,∴∠P2P1P3=∠P13P14P12=2x,∴∠P3P2P4=∠P12P13P11=3x,…,∠P7P6P8=∠P8P9P7=7x,∴∠AP7P8=7x,∠AP8P7=7x,在△AP7P8中,∠A+∠AP7P8+∠AP8P7=180°,即x+7x+7x=180°,解得x=12°,即∠A=12°.故答案为:12°.