The circumference of an isosceles triangle is 70 cm. The ratio of the length of a waist to the length of its bottom is 3:4. How many cm is the bottom of the triangle?

The ratio of the three sides of the triangle is 3:3:4, the bottom is 70 × 43 + 3 + 4, = 70 × 410, = 28 (CM); a: the bottom of the triangle is 28 cm

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