10%=360°×10/100=36°
25%=360°×25/100=90°
a+108°+36°+90°=360°
a=360°-234°=126°
a=126°
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10%=360°×10/100=36°
25%=360°×25/100=90°
a+108°+36°+90°=360°
a=360°-234°=126°
a=126°