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Use the formula, (𝒏 – 2) × 180, where 𝒏 is the number of sides of the polygon, which gives (5 – 2) × 180 = 3 × 180 = 540. The sum of the interior angles in a pentagon is 540°.
Shape A, B and C all have 4 sides and 4 corners, but can you see that Shape D has 5 sides and 5 corners. This is the odd one out. A shape with 5 sides and 5 corners is called a pentagon.
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