Engineering Board Exam Reviewer · Polygons · medium

Find the area of a regular octagon whose side is 4.

1. 64
2. 77.25
3. 56.57
4. 90.5

Answer

B. 77.25

Solution

A=2(1+ 2)s2=2(1+ 2)(16) 77.25.

More Polygons questions

1. Find the apothem of a regular pentagon whose side is 10.
2. Find the area of a regular hexagon whose side is 6.
3. A polygon has 54 diagonals. How many sides does it have?
4. Each interior angle of a regular polygon measures 150°. How many sides does it have?
5. How many diagonals does a decagon have?
6. Find the measure of each exterior angle of a regular octagon.
7. Find the sum of the interior angles of a hexagon.
8. Find the sum of the interior angles of a 12-sided polygon (dodecagon).
9. Find the measure of each interior angle of a regular nonagon (9 sides).
10. How many sides does a regular polygon have if each exterior angle measures 24°?

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