A 3-tier wedding cake is made using 6.4 kg of mixture. The weights of the tiers are in the ratio of 2 : 5 : 9. What is the weight, in grams, of the smallest tier? (SHOW WORKING)

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.