Help please!
Seasonal index = Actual value/Yearly mean. Yearly mean =
Thus seasonal index =
Could someone help with Q3? I got E, from tan^-1(226/210)
That seems correct to me. Am I missing something?
Got a Multiple Choice question I couldn't figure out.
A regular pentagon, ABCDE, has all sides equal to 8cm. The length of EC is closest to: (The triangle is at the top half of the pentagon, thus forming a triangle with 8cm on the left and right upper sides)
I got the right answer but later figured out I mistakenly used Pythagoras, so now idk. Thanks heaps
So this is what I did; disregard if the answer is not A
Looking at it we have an isosceles triangle with 8cm as the identical sides. So therefore if we can deduce the included angle then we can use the cosine rule to deduce the opposite side length.
Considering the sum of angles in a pentagon is 540 then we can do;
Concluding that each angle is 108 degrees within the pentagon
Therefore we now have a triangle with two side lengths of 8, and an included angle of 108. Time to apply cosine rule: