In triangle ABC, the area of triangle ABC is 90, C = 5cm, a: B = 2:3?

In triangle ABC, the area of triangle ABC is 90, C = 5cm, a: B = 2:3?

a: B = 2:3, that is, a = 2 / 3b is substituted into B ^ 2 = a ^ 2 + 25, B = 3 √ 5, a = 2 √ 5, so the triangle area = 2 √ 5 * 5 / 2 = 5 √ 5

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