△ABC is isosceles with AB=AC=5cm and ∠A=100°.Find its area.
要有過程...
Trigonometry 急
2008-08-07 9:22 pm
回答 (1)
2008-08-07 10:00 pm
✔ 最佳答案
Area of △ABC=(1/2)(AB)(AC)sin∠A
=(1/2)(5)^2(sin100)
=12.3cm^2 (corr. to 3 sig .fig.)
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