If the base of an isosceles triangle has length 10 cm and its perimeter is 28 cm, then the length of each congruent side is _______ cm.
(a) 38
(b) 18
(c) 9
(d) 19
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a,b,c are the sides of isoceles triangle
a = b
perimeter = 28 cm
a + b + c = 28 cm
a + a + 10 = 28
2a = 18
a = 9 cm
b = 9 cm
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