(Lesson) Bk6B Unit 13 Application of Circumference

Application of Circumference

Fill in the Blanks

The figure on the right shows three identical circles.

The sum of their circumferences is 18.84 cm. The circumference of each circle is

cm.

Fill in the Blanks

The figure on the right shows three identical circles.

The sum of their circumferences is 18.84 cm. The circumference of each circle is 6.28 cm. The diameter of each circle is

cm.

(Take π = 3.14.)

Fill in the Blanks

The figure on the right shows three identical circles.

The sum of their circumferences is 18.84 cm. The circumference of each circle is 6.28 cm. The diameter of each circle is 2 cm.

Therefore, the length of AB is

cm.

Labeling

The diameter of a circular rest place is 46 cm. It is surrounded by a circular path of width 2 m.

Drag labels to their correct position on the image

2 cm

50 cm

4 cm

46 cm

48 cm

Math Response

The diameter of a circular rest place is 46 cm. It is surrounded by a circular path of width 2 m. How many metres is the perimeter of the path’s outer ring?

(Take π = 3.14.) Expression only

Type answer here

Correct Answer: 50\times3.14

Deg^°

Rad

Dropdown

The radius of the wheel is ​

Select answer

, its diameter is ​

Select answer

. (a) It moves ​

Select answer

forward in one turn. (b) If the wheel makes 3 turns, it moves​

Select answer

forward.

Fill in the Blanks

The diameter of a circular pool is 5 m. Around the pool, there is a path 1 m wide. The diameter of the outer ring is

m.

Math Response

The diameter of a circular pool is 5 m. Around the pool, there is a path 1 m wide. Form expression to find the perimeter of the outer ring of the path. (Take π = $$\frac{22}{7}$$ )

Type answer here

Correct Answer: \left(5+1+1\right)\times\frac{22}{7}

Deg^°

Rad

Math Response

The radius of a Ferris wheel is 14 m. If the Ferris wheel makes 4 complete turns,

how many metres will a carriage move?

(Take π = $$\frac{22}{7}$$ )

Type answer here

Correct Answer: 14\times2\times\frac{22}{7}\times4

Deg^°

Rad