How is the area of a semicircle found?

Mathematics

1 answer:

fenix001 [56]3 years ago

5 0

Answer:

(A) Take half the area of the whole circle.

Step-by-step explanation:

A semi-circle is half of a circle, thus the area of circle is given by:'

Area of circle= ${\pi}r^2$ , where r is the radius of the circle.

Since, A semi-circle is half of a circle, therefore area of the semi circle is also half of the circle, therefore

Area of semi circle= $\frac{{\pi}r^{2}}{2}$

Thus, the area of the semi circle can be found by taking half the area of the whole circle.

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If a=12 and 120% of a is equal to 80% of b then what is a+b

mojhsa [17]

A=12
120% of a =80% of b
120%a = 80%b
120a/100 = 80b/100
Divide through by 100
120a = 80b
Divide through by 80
120a/80 = b
But a=12
120x 12/80 = b
18 = b
b = 18

a+b = 12 + 18 = 30

8 0

2 years ago

Jordan needs one can of juice to make 24 servings of a punch. How many servings of punch can she make with 1/2 a can of juice?

kati45 [8]

Compare the two sets of numbers with a ratio. 1 can for 24 servings is to 1/2 can for x servings.

x= # servings from 1/2 can

1/24= (1/2)/x
cross multiply

1 * x= 24 * 1/2

x= 24/2

x= 12 servings

ANSWER: She can make 12 servings from 1/2 can of juice.

Hope this helps! :)

3 0

2 years ago

Y = – 3

KonstantinChe [14]

The best approximation for the solution to this system of equations is (-2.2,-3)

Option C is correct.

Step-by-step explanation:

Solving the system of equations to get the exact value of x:

$y = -3\\y = x-0.8$