All categories

2 years ago

What is the area of the semicircle (use 3.14 for p)? Please help! Will mark brainlyest.

Mathematics

2 answers:

Andrei [34K]2 years ago

7 0

Answer: the first option: 127.17cm2

Step-by-step explanation:

1. divide the diameter in half to get the radius.

2. multiply the radius squared by pie

3. divide that answer in half

so:

9*9=81

81*3.14= 254.34

254.34/2= 127.17

Marizza181 [45]2 years ago

4 0

Answer:

127.17 cm²

Step-by-step explanation:

Area of a semicircle: 1/2*π*r²
π (pi) = 3.14
r (radius) = d (diamater) / 2 => 18/2 = 9 cm

A = 1/2*π*r²

A = 1/2*3.14*9²

A = 1/2*3.14*81

A = 3.14*40.5

A = 127.17 cm²

Therefore, the area of the semicircle is 127.17 cm²

Hope this helps!

You might be interested in

Today's high temperature is 72°F. If yesterday's high temperature was 87°F, what was the change in high temperatures? -15°F

makkiz [27]

Answer:

15°F

Step-by-step explanation:

It is given that,

Today's high temperature is 72°F and yesterday's high temperature was 87°F. We need to find the change in high temperatures.

Change in temperatures = final temperature - initial temperature

= 87°F - 72°F

= 15°F

It means that the change in temperature is 15°F. Hence, the correct option is (b).

8 0

3 years ago

Read 2 more answers

The hypotenuse of a 45°-45°-90° triangle measures 4 cm. What is the length of one leg of the triangle? 2 cm 2 StartRoot 2 EndRoo

Oxana [17]

Answer:

$2\sqrt{2} cm$

Step-by-step explanation:

In order to solve this you just have to remember the formula for the sides and hypotenuse of the triangle rectangle:

$c^{2} =a^{2} +b^{2}$

Since A and B are equal we will use X to represent them both:

$c^{2} =a^{2} +b^{2}\\4^{2} =x^{2} +x^{2}\\16 =2x^{2}\\8=x^{2} \\x=\sqrt{8}=\sqrt{4*2}=2\sqrt{2}$

ANd by solving the equation we get that the length of the legs of the triangle rectangle with a hypotenuse of 4cm is $2\sqrt{2} cm$

7 0

3 years ago

Read 2 more answers

The range of this function is {2, 4, 5, 6}

Alborosie

Answer:

True l True-----------------^~^

7 0

3 years ago

11 El prisma tiene 9 caras, 9 aristas y 6 vertices. (2 puntos) Cierto Falso 1

Levart [38]

Hi! I don’t know what any of this means but I hope you have an amazing day and I hope god/allah/etc. blesses you :)
sorry I couldn’t answer

4 0

2 years ago

Which statements about the value of the digits in the number 6,666,666 are true? Choose all answers that are correct. A. The dig

Degger [83]

I chose the answer A

3 0

3 years ago