The central angle is 185; this means that the sector makes up 185/360 of the total circle.

We will multiply this fraction by the area of the total circle. The area of a circle is given by A =u03c0ru00b2. Since the diameter is 6.4, the radius is 6.4/2 = 3.2:

A = 3.14(3.2)u00b2 = 32.1536

We multiply this by the fraction of the circle the sector represents: 185/360(32.1536) = 16.52

Geometry B Unit 5: Area – Lesson 10: Area Unit Test

1. What is the area of the trapezoid? The diagram is not drawn to scale.n

72 cm^2n

n

2. Given the regular polygon, what is the measure of each numbered angle?n

nmu22211 = 36u00b0; mu22212 = 72u00b0n

n

3. What are a) the ratio of the perimeters and b) the ratio of the areas of the larger figure to the smaller figure? The figures are not drawn to scale.

5/2 and 25/4n

4. What is the area of a regular pentagon with a side of 12 in.? Round the answer to the nearest tenth.

247.7 in.2n

5. Name the minor arc and find its measure.n

nAB; 162u00b0n

n

6. What is the circumference of the given circle in terms of pi_symbol?n

28pi in.n

7. What is the area of the given circle in terms of pi?n

10.89pi m^2n

8. What is the area of a sector with a central angle of 185u00b0 and a diameter of 6.4 m? Round the answer to the nearest tenth.

16.5 m^2n

9. What is the area of the shaded region in the given circle in terms of pi_symbol and in simplest form?n

## Answers ( 2 )

The area is 16.52.

The central angle is 185; this means that the sector makes up 185/360 of the total circle.

We will multiply this fraction by the area of the total circle. The area of a circle is given by A =u03c0ru00b2. Since the diameter is 6.4, the radius is 6.4/2 = 3.2:

A = 3.14(3.2)u00b2 = 32.1536

We multiply this by the fraction of the circle the sector represents:

185/360(32.1536) = 16.52

Geometry B Unit 5: Area – Lesson 10: Area Unit Test1. What is the area of the trapezoid? The diagram is not drawn to scale.n72 cm^2n

n

2. Given the regular polygon, what is the measure of each numbered angle?nnmu22211 = 36u00b0; mu22212 = 72u00b0n

n

3. What are a) the ratio of the perimeters and b) the ratio of the areas of the larger figure to the smaller figure? The figures are not drawn to scale.5/2 and 25/4n

4. What is the area of a regular pentagon with a side of 12 in.? Round the answer to the nearest tenth.247.7 in.2n

5. Name the minor arc and find its measure.nnAB; 162u00b0n

n

6. What is the circumference of the given circle in terms of pi_symbol?n28pi in.n

7. What is the area of the given circle in terms of pi?n10.89pi m^2n

8. What is the area of a sector with a central angle of 185u00b0 and a diameter of 6.4 m? Round the answer to the nearest tenth.16.5 m^2n

9. What is the area of the shaded region in the given circle in terms of pi_symbol and in simplest form?n(270 pi + 81 Root 3) m^2