<span><span>Each time
we add a side (triangle to quadrilateral, quadrilateral to pentagon, etc), we </span>add
another 180°<span> to the total of the
interior angle.</span></span>
Triangle,
sum interior angle is 180
Square,
is 360
Pentagon is
540
So the
formula is
<span>180 ( n –
2 )</span>
7 x 2 = 14
3 x 1 = 3
14+3 = 17
answer 17 unit^2
Two<span> trains </span>leave different<span> cities heading toward each </span>other<span> at </span>different<span> speeds. ... At the </span>same time<span>Train B, </span>traveling 60 mph<span>, leaves Eastford heading toward Westford. ... Since an equation remains true as </span>long<span> as we perform the </span>same<span> operation ... that the train's rate is 40 </span>mph<span>, which means it </span>will travel<span> 40 </span>miles<span> in </span>one<span> hour.</span>