395. Найдите площадь равнобедренного треугольника с основанием 10 см и боковой стороной 13 см.

To find the area of an isosceles triangle, we first need to find its height. Using the Pythagorean theorem on half of the isosceles triangle (forming a right-angled triangle with hypotenuse 13 cm and one leg 5 cm, which is half of the base), the height (h) is calculated as h = sqrt(13² - 5²) = sqrt(169 - 25) = sqrt(144) = 12 cm. The area of the triangle is then (1/2) * base * height = (1/2) * 10 cm * 12 cm = 60 cm².