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Math topic! ! ! ! The topic of Hong Kong Secondary Three! ! ! Urgent! ! !
A) According to Pythagorean Theorem (55 2)-(33 2) = 44

B) The vertical distance divided by the horizontal distance is y/x on the coordinate axis, so 33/44=3/4.

C) It can be obtained by using COSA = (b 2+c 2-a 2)/(2bc), (33 2)+(55 2)-(44 2)/2 (33 * 55) = 0.6cos0.6 = 36.9.

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