Question

find the unknown angle a​

Answer 1

Answer:

137

Step-by-step explanation:

sum of all sides of a heptagon is 900 degrees

the sum of the given angles is 763 degrees

so to find the unknown angle we have to subtract 763 from 900

which is equal to 137 degrees

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Answer 2

Answer:

as there are 8 angles

it is octagon

sum of  angles in octagon

1080

substituting you get your answer

Step-by-step explanation: