caption: The image shows a diagram of a circle with a circle in the middle of it, surrounded by text that reads "Geogebra applet press enter to start activity". The circle is composed of several concentric circles, each with a different angle, and the text is written in a bold font. The circles are arranged in a symmetrical pattern, with the center of the circle being the largest and the outermost circle being slightly larger than the innermost circle. The text is surrounded by a thin black border, giving the image a modern and professional look.