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timama [110]
4 years ago
7

A circle has a radius of 5 inches. What is the area of the sector formed by a central angle measuring 1.5 radians?

Mathematics
1 answer:
emmasim [6.3K]4 years ago
4 0
We know that

[area of a circle]=pi*r²
r=5 in
[area of a circle]=pi*5²---------> 78.5 in²

if 2pi radians ( full circle) has an area of-------------------> 78.5 in²
1.5 radians------------------------------------------> X
X=1.5*78.5/2pi---------> 18.75 in²

the answer is
<span>the area of the sector formed by a central angle is </span>18.75 in²
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Find the length of OX
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Answer:

Length OX = 7.09 units

Step-by-step explanation:

The diagram of the full question is attached to this solution.

Let the length of OX be x

Then length of OD = (13 - x)

From the image of the figure, it is given that

Angle BOL = Angle LOP

Let that angle be equal to θ

Angle BOL = Angle LOP = θ

But since lines BX, OL and PD are evidently parallel to one another, we can say that

Angle OPD = Angle LOP = θ (alternate angles are equal)

Also, Angle OBX = Angle BOL = θ (alternate angles are equal)

And from trigonometric relations,

Sin θ = (x/12)

And

Sin θ = (13 - x)/10

Since sin θ = sin θ

We can then equate

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cross multiplying

10x = 12 (13 - x)

10x = 156 - 12x

10x + 12x = 156

22x = 156

x = (156/22) = 7.091 = 7.09 to the nearest hundredth.

Hence, length OX = 7.09 units

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Step-by-step explanation:

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