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Olenka [21]
2 years ago
11

What fractions above are equivalent? ( fractions on picture )

Mathematics
1 answer:
Andrews [41]2 years ago
4 0

Answer:

the first one and the last one

Step-by-step explanation:

big smartz

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Find The art length of a sector with an area of 8 square units.
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\bf \textit{area of a sector of a circle}\\\\
A=\cfrac{\theta \pi r^2}{360}\quad 
\begin{cases}
r=radius\\
\theta =angle~in\\
\qquad degrees\\
------\\
A=8\\
r=4
\end{cases}\implies 8=\cfrac{\theta \pi 4^2}{360}\implies \cfrac{8\cdot 360}{4^2\pi }=\theta 
\\\\\\
\cfrac{2880}{16\pi }=\theta \implies \boxed{\cfrac{180}{\pi }=\theta }\\\\
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\bf \textit{arc's length}\\\\
s=\cfrac{\theta \pi r}{180}\quad 
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r=radius\\
\theta =angle~in\\
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\theta =\frac{180}{\pi }\\
r=4
\end{cases}\implies s=\cfrac{\frac{180}{\underline{\pi} }\underline{\pi} \cdot 4}{180}\implies s=\cfrac{\underline{180}\cdot 4}{\underline{180}}
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\boxed{s=4}

if you do a quick calculation on what that angle is, you'll notice that it is exactly 1 radian, and an angle of 1 radian, has an arc that is the same length as its radius.

that's pretty much what one-radian stands for, an angle, whose arc is the same length as its radius.
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3 years ago
This trapezium is drawn on a centimetre grid <br> Find the area of the trapezium
MissTica

Answer:

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Step-by-step explanation:

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Step-by-step explanation:


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