Answer:
for a triangle the sum of interior angles is 180° (3 sides)
for a quadrilateral it is 360° (4 sides)
for a pentagon it is 540° (5 sides)
for a hexagon it is 720° (6 sides)
for a heptagon it is 900° (7 sides)
so the conclusion is that just keep on adding 180° to the previous one
according to the question it is a quadrilateral... so, the answer is 360°
Step-by-step explanation:
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