Michael cycled 36km in 3 hours.Work out his avarage speed.

2 answers:

8 0

Hello mate,
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$\\ speed = \frac{distance}{time } \\ average \: speed \: = \frac{36 \: km}{3 \: hr \: } \\ speed \: = 13 \frac{km}{hr}$

average speed = 13 km/he
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I hope it helps :-)

posledela3 years ago

3 0

Average speed would be total distance divided by total time so this would mean 36/3 which equals to 13 the answer is 13 km/h

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a pyramid has a regular hexagonal base with side length of 4 and a slant height of 6. what is the total area of the pyramid

Stels [109]

So hmm notice the picture below

the pyramid itself, is really, just one regular hexagon, at the bottom
and 6 triangles, stacked up at each other at the edges

now, if you just get the area of the regular hexagon, and the 6 triangles, add them up, that'd be the total surface area of the pyramid then
$\bf \textit{area of a regular polygon}\\\\
A=\cfrac{1}{4}\cdot n\cdot s^2\cdot cot\left( \frac{180}{n} \right)\qquad 
\begin{cases}
n=\textit{number of sides}\\
s=\textit{length of a side}\\
\frac{180}{n}=\textit{angle in degrees}\\
----------\\
n=6\\
s=4
\end{cases}\\\\\\ A=\cfrac{1}{4}\cdot 6\cdot 4^2\cdot cot\left( \frac{180}{6} \right)$

now, for the triangles, well, area of a triangle is 1/2 bh, as you'd know, and you have both