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The upper bound for a fraction uses the highest possible value for the top and the lowest possible value for the bottom. Answers given to the nearest cm can be 0.5 cm = 0.005 m more or less. In this case that issinA = 5.005 / 6.445 = 0.7766 (4 d. p.)EDIT. It could be argued that four decimal places is too much and so 0.777 or 0.78 but it is a matter of opinion.

this is how it should be done…First change the metres into cm (500cm and 645cm)Find the upper bound of h= 500.5cmNext find the lower bound of L= 644.5cmTherefore 500.5/644.5 = 0.777 (appropriate degree of accuracy basically means a suitable number of figures)If u then want to find the actual angle of incline:The opposite of sin is sin inverse so, sin inverse 0.777sin-1(0.777)= 50.7°

sina=5.05/6.445sin-1(5.05/6.445)=aa=51.58705981