Apothem, Side, Perimeter, Central Angle, Area

What is the measure of a central angle of a regular Decagon (polygon with 10 sides)?

• 20°

• 30°

• 36°

• 45°

• 60°

Find the apothem of a regular hexagon with a side length of 15 cm. (Hint: the triangle shown is a special right triangle)

Find the apothem of a equilateral triangle with side length of 24 cm. Round to the nearest tenth if necessary.

• 6 cm

• 6.9 cm

• 13.6 cm

• 20.8 cm

What is the area of a hexagon with a perimeter of 36 cm, and an apothem with length 5.2 cm

How do you find the central angle of a polygon with "n" sides?

• Multiply 360 by n

• Divide 360 by n

• multiply 180 by n

• Divide 180 by n

Find the radius of a regular hexagon with side length of 8 cm.

• 4 cm

• 8 cm

• 5.2 cm

Find the AREA of an equilateral triangle with an apothem of 2 cm. Hint: (draw out the triangle, find central angle and divide by 2)

• 15 cm

What is the AREA of a pentagon with perimeter of 40 cm and an apothem of 5.5 cm.