Exercises: Polygons, Construction, and Angle Sums

Use the interior angle sum formula $(n-2) \times 180\degree$ and remember: dividing by $n$ to get a single angle only works for regular polygons.

Grade 7·16 problems·~25 min·Uganda NCDC Primary 7 Mathematics·lesson·construction-03

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Fluency Practice

An equilateral triangle has all three sides of length $6$ cm. What can you say about its three angles?

They are all $60\degree$ , since equal sides in a triangle force equal angles, and the three angles of any triangle sum to $180\degree$

They could be any three values, since side lengths and angle sizes are treated as completely unrelated properties in a triangle

Only two of them are equal to each other; the third can be a different size even though all three sides are $6$ cm long