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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!

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A rectangular prism has a volume of 572 cubic inches. The prism is 4 inches long and 13 inches wide. What is the height of the p

Leya [2.2K]

Answer:

Height of rectangular prism = 11 inches

Step-by-step explanation:

Given that:

Volume of rectangular prism = 572 cubic inches

Length of prism = 4 inches

Width of prism = 13 inches

Volume of prism = Length * Width * Height

572 = 4 * 13 * h

572 = 52h

52h = 572

Dividing both sides by 52

$\frac{52h}{52}=\frac{572}{52}\\h=11$

Hence,

Height of rectangular prism = 11 inches

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3 years ago

9. A cup of tea costs x pence. Coffee costs 20 pence more. Hermes buys 2 cups of tea and one cup of coffee. In total Hermes pays

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Answer:

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Step-by-step explanation:

Given:

Tea = x
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Comparing the total cost, work out the value of x:

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2 years ago

Solve the following initial-value problem: (ex+y)dx+(3+x+yey)dy=0, y(0)=1 0=

alex41 [277]

Answer:

$e^x+xy+3y+(y-1)e^y=4$

Step-by-step explanation:

Given that

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$M=e^x+y$

$N=3+x+ye^y$

We know that

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it means that this is a exact equation.

$\int d\left(e^x+xy+3y+(y-1)e^y\right)=0$

Noe by integrating above equation

$e^x+xy+3y+(y-1)e^y=C$

Given that

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$e^0+0+3+(1-1)e^1=C$

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So the our final equation will be

$e^x+xy+3y+(y-1)e^y=4$

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3 years ago

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vovangra [49]

Answer:

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Step-by-step explanation:

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2 years ago

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kvv77 [185]

Answer:

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Step-by-step explanation:

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2 years ago

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