The sides of a triangle have lengths (in cm) 10, 6.5 and a, where a is a whole number. The minimum value that a can take is
(a) 6
(b) 5
(c) 3
(d) 4
By triangle inequality, \(10 - 6.5 < a < 10 + 6.5\). So \(3.5 < a < 16.5\). The minimum integer value is 4.