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(a) What is the sum of the interior angles of this quadrilateral? °
(b) Work out the size of the angle marked x° : °
(a) What is the sum of the interior angles of an octagon?
(b) An octagon has 6 angles of 140° each.
If the two remaining angles are equal, what is the size of each of them?
The diagram shows a regular pentagon and a regular octagon:
Work out the size of the angle marked y:
y = °