Checking and securing understanding of interior angles

12 questions

1. Angles that meet at a single point on a straight line sum to ___°.
2. Angles are __________ if they sum to 180°.
3. Two angles meet to form a straight line. One angle is 60°. The other angle is ___°.
4. Squares and equilateral triangles are examples of __________ polygons.
5. A regular octagon has an edge with length 5 cm. Therefore, its perimeter is ___ cm.
6. A regular decagon has a perimeter of 40 cm. Therefore, each of its edges are of length ___ cm.
7. Two of the interior angles of a triangle are 80° and 45°. The size of the third interior angle is ___°.
8. The interior angles of a pentagon sum to ___°.
9. Each interior angle of a regular hexagon is ___°.
10. A regular polygon has interior angles of size 150°. The polygon has ___ sides.
11. Which of these interior angles are possible in a regular polygon?
12. One of the interior angles in an isosceles triangle is 70°. Which are possible sizes for one of the other interior angles?

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