Area of a Circle — Unit test Answers

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Which statement is true about the circumference of a circle?

A
The circumference is the measurement around the circle.
B
The circumference is the measurement of the radius.
C
The circumference is the measurement of the diameter.
D
The circumference is double the radius.
7

Eugene knows the circumference of a circle is 125.6 meters. Does he have enough information to find the area?

A
Yes, because he could divide by 3.14 to find the diameter and then divide that result by 2 to find the radius. Once he has the radius, he can use the formula.
B
Yes, because the area will just be twice the circumference so all he has to do is multiply by 2.
C
No, because the circumference equals and there is no in 125.6.
Option C
D
No, because the circumference equals so he could only find the diameter. He needs the radius for the area formula.
Option D
10

Which name accurately describes the figure shown below and why?

Question illustration
A
trapezoid, because it has four sides of equal length and opposite sides that are parallel
B
trapezoid, because it has four sides of equal length and four right angles
C
rhombus, because it has four sides of equal length and opposite sides that are parallel
D
rhombus, because it has four sides of equal length and four right angles
12

Kayley needs to find the area of a circle. Which process should she use?

A
She should multiply the diameter by 2 and then multiply the result by 3.14.
B
She should multiply the radius by 2 and then multiply the result by 3.14.
C
She should square the diameter and then multiply the result by 3.14.
D
She should square the radius and then multiply the result by 3.14.
14

If is 155°, what is ?

Question illustration
A
25°
B
35°
C
155°
D
180°
15

Joo-Eun wants to draw a triangle with sides measuring 6 mm, 8 mm, and 11 mm. Which is true about Joo-Eun’s plan?

A
Joo-Eun cannot draw a triangle with these side lengths.
B
Joo-Eun can only draw one unique triangle with these side lengths.
C
Joo-Eun can draw exactly two triangles with these side lengths.
D
Joo-Eun can draw more than one triangle with these side lengths.

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