domes and half domes in the Aya Sofia
![Image](https://www.geogebra.org/resource/GX9HbASv/FsyaTGT75C5Iq8ey/material-GX9HbASv.png)
![Image](https://www.geogebra.org/resource/xGMTHj9M/t1dmDPRBLcxtXmuY/material-xGMTHj9M.png)
sustaining domes
Another option for supporting a dome is to build adjacent domes and/or half domes. In the Aya Sofia (around 536 - Istanbul) adjacent half domes support the central dome witch has a perimater of 33 m. The half domes themselves are supported by lower supplemantary buildings. So the horizontal powers of the central dome are supported stepwise.
![Image](https://www.geogebra.org/resource/h755vWd6/DoTLI8siTIDWV0Rc/material-h755vWd6.png)