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3 years ago

Circumference (rounding)

Mathematics

2 answers:

koban [17]3 years ago

5 0

Answer:

radius r = 3.1 in

diameter d = 6.2 in

circumference C = 19.4778745 in

area A = 30.1907054 in2

LUCKY_DIMON [66]3 years ago

4 0

Answer:

19.5

Step-by-step explanation:

Circumference is radius multiplied by 2, then multiplied by pi.

3.1 × 2= 6.2

6.2 × π= 19.477 ≈ 19.5

π also equals 3.14

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Jillian is making a paper flower motif for an art project the flower she is making has 4 petals each petal is made of three semi

Alla [95]

Answer:

$Area = 216\pi$

Step-by-step explanation:

Given

See attachment for semicircles

Required

The area of the paper

First, calculate the area of each petal.

The petal is made up of:

1. Semicircle of diameter 12cm

2. Semicircle of diameter 18cm (i.e. 12cm + 6cm)

3. A hole semicircle of diameter 6cm

The area of each semicircle is calculated as follows:

$Area = \frac{\pi r^2}{2}$

For (1):

$d = 12cm$ --- diameter

$r = 0.5 * d = 0.5* 12cm = 6cm$ --- radius

So:

$A_1 = \frac{\pi * 6^2}{2}$

Evaluate the exponent

$A_1 = \frac{\pi * 36}{2}$

Divide 36 by 2

$A_1 = 18\pi$

For (2):

$d = 18cm$

$r = 0.5* 18cm = 9cm$

So:

$A_2 = \frac{\pi * 9^2}{2}$

$A_2 = \frac{\pi * 81}{2}$

$A_2 = 40.5\pi$

For (3):

$d = 6cm$

$r = 0.5* 6cm = 3cm$

So:

$A_3 = \frac{\pi * 3^2}{2}$

$A_3 = \frac{\pi * 9}{2}$

$A_3 = 4.5\pi$

Recall that (3) is a hole.

So, the area (A) of a petal is:

$A = A_1 + A_2 - A_3$

$A = 18\pi + 40.5\pi - 4.5\pi$

$A = 54\pi$

The paper uses 4 petals.

So:

$Area = 4 * A$

$Area = 4 * 54\pi$

$Area = 216\pi$

4 0

3 years ago

ABCD is a parallelogram.

umka21 [38]

9514 1404 393

Answer:

6 cm

Step-by-step explanation:

The area of the parallelogram is the same, either way you figure it.

A = bh

A = CD(length ⊥ to CD)

A = (9 cm)(8 cm) = 72 cm²

A = AD(length ⊥ AD)

72 cm² = (12 cm)(length ⊥ AD)

(length ⊥ AD) = (72 cm²)/(12 cm) = 6 cm

The perpendicular distance of AD from BC is 6 cm.

4 0

3 years ago

Which of the following number cannot represent the 3 sides of a triangle?

Advocard [28]

Answer:

d 5,16,21 Am sure I think

Step-by-step explanation:

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Step-by-step explanation:

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3 years ago

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allochka39001 [22]

Answer:

Step-by-step explanation:

Because if two parallel lines are intersect by a transversal then alternate exterior angles are equal.

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3 years ago