题目

Noise pollution in cities is causing out health to suffer, according to the World Health Organization. Recently, researchers at the Free University of Brussels in Beigium have developed an applocation: NoiseTube. It allows everyone who downloads it the ability to measure the amount of noise they are exposed to by transforming their smart phone into a sound level meter. NoiseTube works by recording sound levels and GPS locations. Once launched the app shows decibel(分贝) levels of green or red depending on the level of noise. That information is then sent to the NoiseTube server via t若直线2x-y+1=0平分圆x2+y2+2x-my+1=0的面积，则m=______．