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Suppose an isosceles triangle ABC has A = 30° and b = c = 5. What is the length of a2?
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Suppose an isosceles triangle ABC has A = 30° and b = c = 5. What is the length of a2?

User Chuk Lee
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You wanna use the Sine rule. So, a/sin30 = 5/sin75
You want to make a the subject, so you multiply both sides by sin30 so now you have a = 5sin30/sin75
If you square this number you get 6.7
User Bambax
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