Check the picture below.

now, the sides at the bottom, the straight sides, are plain to see how long each is, you can pretty much count the units off the grid.

so, the only ones you need the distance formula or pythagorean theorem is the slanted ones, there are two, and both are equal, so, just get the length of one, and double it up.

$\bf \textit{distance between 2 points}\\ \quad \\
\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
% (a,b)
&({{ 2}}\quad ,&{{ 7}})\quad 
% (c,d)
&({{ 6}}\quad ,&{{ 4}})
\end{array}\qquad 
% distance value
d = \sqrt{({{ x_2}}-{{ x_1}})^2 + ({{ y_2}}-{{ y_1}})^2}
\\\\\\
d=\sqrt{(6-2)^2+(4-7)^2}\implies d=\sqrt{4^2+(-3)^2}\implies d=\sqrt{16+9}
\\\\\\
d=\sqrt{25}\implies d=5$

double that up, and both slanted sides are 10, the perimeter is all sides summed up.

5 0

3 years ago

a student earned a grade of 80% on a math test that had 25 problems. how many problems on this test did the student answer corre

Mamont248 [21]

80% of 25
percent means parts out of 100
'of' means multiply
80% of 25 means
80/100 times 25=40/50 times 25=20/25 times 25=20

answer is 20 problems

6 0

3 years ago

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