what is its role in architecture?
Serve as blueprint or plan to design Buddhist structures,
Mandala
Buddhist architecture often applied mandala as the blueprint or plan to design Buddhist structures, including temple complex and stupas.
who built the melbourne castle? Thomas, 2nd Earl of Lancaster when was it built? 1311 - 1322 what rooms can you find in this castle? bakehouse, kitchen, chapel, hall, great chamber, and drawbridge. what are the types of the third one? Bridge chapel, castle chapel, and parecclesion what is the purpose of it? Prayer and worship where does the latter term comes from? Old English "weorþscipe" what does it refer to in buddhism? May take innumerable forms given the doctrine of skillful means; guru yoga, mandala, thanka, etc. what  is the meaning of second skillful means you just mentioned? A geometric configuration of symbols. is it used in offerings? Yes
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Mandala [SEP] In architecture
Buddhist architecture often applied mandala as the blueprint or plan to design Buddhist structures, including temple complex and stupas. A notable example of mandala in architecture is the 9th century Borobudur in Central Java, Indonesia. It is built as a large stupa surrounded by smaller ones arranged on terraces formed as a stepped pyramid, and when viewed from above, takes the form of a giant tantric Buddhist mandala, simultaneously representing the Buddhist cosmology and the nature of mind. Other temples from the same period that also have mandala plans include Sewu, Plaosan and Prambanan. Similar mandala designs are also observable in Cambodia, Thailand and Myanmar.