Question

8. Find the value of F1 and F2 if the value of alpha lies between 90 to 170 degree as shown in figure 5.
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Answer 1

F2 10°

F1 15°

Explanation:

if alpha =90° than F2 will be 90°+90° bcoz it is in linear pair whose sum is 180°

but we can see that here F2 doesn't form a right angle so it's answer is 10°

and for f1

10n = f3 (suppose)

we know that in stereight line point = +5 point 2

so, F1 = 10+5=15