Geometry Unit 2 Review

What is the sum of the interior angles of the decagon?

• 360°

• 180°

• 1080°

• 1440°

• 60°

• 45°

• 90°

• 30°

A polygon has an interior angle sum of 2160°. How many sides must the polygon have? Enter the number of sides the polygon will have.

If the length of each leg of an isosceles triangle is 10 meters, and the base is 12 meters long, what is the length of the altitude to the base?

• 8m

• 15 m

• 8.5m

What is the value of x?

A triangle has angles that measure (x + 30)°, (2x + 25)°, and (9x + 65)°, respectively. Which of the following terms describes this triangle?

• Equilateral

• Isosceles

• Right

• Obtuse

In the diagram, ΔABC is an equilateral triangle with a perimeter of 24 inches. What is the length of altitude h of this triangle?

• 4√2

• 8√2

• 4√3

• 8√3

If EF = 9, the value of AC is_____