Let a cm – the length of the equal sides of an isosceles triangle, and b cm – the length of its base.
The perimeter will be calculated by the expression 2a + b cm.
Let’s compose and solve a system of equations.
2a + b – 30 = a;
2a + b – 40 = b.
2a = 40;
a = 20 cm.
b = 30 – a = 30 – 20 = 10 cm.
Answer: the sides of the triangle are 20 cm and 10 cm.
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