Answer:
11) 1080°
12) 900°
Step-by-step explanation:
11) the letter T forms an 8-sided figure (octagon)
to find the sum of the interior angles in any shape, use this formula:
(n-2)·180° where 'n' is the number of sides
(8-2)·180 = 6(180) = 1080°
12) this shape has 7 sides so:
(7-2)·180° = 5(180) = 900°
