愛情小天使 19-9-2005 19:48
F.5 Maths
Two sides of a parallelogram are 10 cm and 6 cm long. One of its interior angles is 60 degree.
Find a) the area of the parallelogram [Ans: 30root2]
b) the length of the longer diagonal [Ans: 14]
個area 我試過用 6x10xsin60 都唔得, answer 變o左 30root3