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We study the spatial distribution of transmit powers and signal to interference plus noise ratio (SINR) in device-to-device (D2D) networks. Using homogeneous Poisson Point Processes (PPP), cumulative distribution function (CDF) of the transmit power and SINR are analytically derived for a D2D network employing power control. Then, computer simulations are performed for the same network architecture and it is shown that device location modeling and analytical methods from stochastic geometry can enable us to obtain transmit power and SINR distributions of a D2D network.