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3 years ago

Can someone tell me the answer

Mathematics

1 answer:

abruzzese [7]3 years ago

8 0

Answer:

y = 43°

Step-by-step explanation:

The unknown angle x inside the quadrilateral is adjacent to 80° and sum to 180° , then

x = 180° - 80° = 100°

The sum of the 4 interior angles of a quadrilateral = 360°

sum the 4 angles and equate to 360°

y + 145° + 72° + 100° = 360° , that is

y + 317° = 360° ( subtract 317° from both sides )

y = 43°

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Step-by-step explanation:

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