The area of the semi circle is 8

Mathematics

1 answer:

dangina [55]2 years ago

5 0

Answer:

Consider a circle of radius 8 centimetres. Recall that the centre angle in a circle is always 360˚ . However, a semi-circle is a circle cut in half.

Step-by-step explanation:

So, the formula for the area of a semicircle is A = pi * r^2/2. Let's use that formula to calculate the area of a semicircle with a radius of 8 inches. We'll use 3.14 as an approximation of pi. So, now we plug the values into the equation.

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Help. Pic attached. I do not understand how to get the numbers.

Dima020 [189]

Answer:

If they are same side interior or same side exterior they will always add up to 180 so if you have m<7 = 131 then you subtract 131-180 and then you have the angle for one and you do it so on and so forth. If you have A corresponding angle, alternate exterior,alternate interior or a vertical angle they will be the same number at the angle given.

8 0

2 years ago

PLEASE HELP

rodikova [14]

Answer: B. 1/2(y - 116) = 64

Step-by-step explanation:

Since, we know that,

The angle formed by two tangent = $\frac{1}{2}(\text{Difference of intercepted Arcs} )$

= $\frac{\text{major arc - minor arc}}{2}$

Here, Major arc = y°

Minor arc = 116°

And, Angle made by two tangents YX and YZ,

$m\angle XYZ = \frac{\text{y - 116}}{2}$

$64 = \frac{\text{y - 116}}{2}$ ( because, $m\angle XYZ = 64^{\circ}$ )

⇒ $\frac{\text{y - 116}}{2} = 64$

Which is the required equation to find y, the measure of XWZ.

Thus, Option B is correct.

8 0

2 years ago

Read 2 more answers

A rectangular prism is 9.8 inches long, 20 inches wide, and 5 inches high. what is the surface area of the rectangular prism?

Sliva [168]

The prism has 6 faces: 2(length·width), 2(length·heighth), & 2(width·heighth)
2(length · width) = 2(9.8 · 20) = 2(196) = 392 in²
2(length · heighth) = 2(9.8 · 5) = 2(49) = 98 in²
2(width · heighth) = 2(20 · 5) = 2(100) = 200 in²

The sum of the faces is the surface area (S.A.)
392 in² + 98 in² + 200 in² = 690 in²

3 0

2 years ago

If f(x) = 2x2 + 5x - 8 and f(x) = -10,<br> which of the following could be a<br> value for x?<br> -2

alexdok [17]

Answer:

x = -2 or x = -1/2

Step-by-step explanation:

We can just set up an equation where the quadratic is equal to -10, and then solve the equation:

$2x^2+5x-8=-10\\2x^2+5x+2=0\\\\$