Which formula is used to find the circumference of a circle when the radius is given?(1 point)%0D%0AResponses%0D%0A%0D%0AC=π2d%0D%0Aupper C equals 2 d%0D%0A%0D%0AC=π2r%0D%0Aupper C equals 2 r%0D%0A%0D%0AC=πr2%0D%0Aupper C equals r squared%0D%0A%0D%0AC=πr say the right answer