Isosceles Triangle Vertex angle sin(β) = b/ 2a Isosceles Triangle Base angle sin(α) = h / a Isosceles Triangle Altitude alt = (b/2a) * √(4a² - b²) Isosceles Triangle Seimeperimeter s = a + (b/2) Isosceles Triangle Height h = (1/2) * √(4a² - b²) Isosceles Triangle Area K = (1/4) * b * √( 4 * a² - b² ) The base length of an isosceles triangle b = 8 cm The side length of an isosceles triangle a = 5 cm
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