All categories

2 years ago

The radius of a semicircle is 3 kilometres. What is the semicircle's perimeter?

Mathematics

1 answer:

alina1380 [7]2 years ago

6 0

Answer:

In terms of Pi: $3\pi + 6$ km

Exact value (rounded): 15.42477 km

Approximated (3.14): 15.42 km

Step-by-step explanation:

Hello!

A semicircle's perimeter can be found using the formula: $P = \pi r + 2r$

We can plug in the values to solve for the perimeter.

<h3>Solve</h3>

$P = \pi r + 2r$
$P = \pi(3)+ 2(3)$
$P = 3\pi + 6$

In terms of Pi, it is $3\pi + 6$ ,

Exact value of Pi, it is 15.42477

Approximation of Pi (3.14), it is = 15.42

You might be interested in

Marisa has at most $50 to spend on clothes. She wants to buy jeans that cost $25. With the money that she has left over, she wan

Reika [66]

$50 \geqslant 6x + 25$

6 0

3 years ago

Javi are selling cookies at different rates. She charges $1.25 per cookie when a customer buys fewer than 12 cookies. If a custo

gavmur [86]

Answer:

1.25÷12=9.6

12÷0.75=16

16÷9.6=1.6666667

3 0

3 years ago

What is a decomposition reaction?

yaroslaw [1]

Answer:

11-6√3 = a -b√3

where a=11 and b =6

Step-by-step explanation:

Step(i):-

Given

$\frac{5+2\sqrt{3} }{7+4\sqrt{3} }$

Rationalize

= $\frac{5+2\sqrt{3} }{7+4\sqrt{3} } X \frac{7-4\sqrt{3} }{7-4\sqrt{3} }$

= $\frac{(5+2\sqrt{3})(7-4\sqrt{3} ) }{7^{2} -(4\sqrt{3})^{2} }$

= $\frac{(5+2\sqrt{3})(7-4\sqrt{3} ) }{49-16(3) }$

= $\frac{(5+2\sqrt{3})(7-4\sqrt{3} ) }{1 }$

Step(ii):-

Multiply

${(5+2\sqrt{3})(7-4\sqrt{3} ) }$

= 5 × 7 - 5×4√3 + 2√3 ×7 - 2√3 × 4√3

= 35 -20√3+ 14√3-8×3

= 35 - 6√3 -24

= 11-6√3

6 0

3 years ago

the volume of a pencil case is 20 in3 the pencil case is a rectangular prism with a hight of 8 in and a lenght of 5 in

nydimaria [60]

V = l*w*h
20 = 5*w*8
20 = 40*w
divide both sides by 40
20/40 = w
1/2 = w
The width is 1/2 inch

8 0

3 years ago

Which represents this solid figure Need HELP ASAP

Sladkaya [172]

The answer is net three

8 0

3 years ago

Read 2 more answers