Answers:
Given,
The sum of the two sides must be equal to the square of the third side.
The three sides of the triangle – a, b and c.
(i)
a = 9 cm
b = 16 cm
c = 18 cm
????2 + ????2 = 92 + 162
=>81 + 256
=>337
????2 = 192
=>361
????2 + ????2 ≠ ????2
Thus, the given triangle is not right-angled.
(ii)
a =7 cm
b = 24 cm
c = 25 cm
????2 + ????2 = 72 + 242
=>49 + 576
=>625
????2 = 252
=>625
????2 + ????2 = ????2
Thus, the given triangle is a right-angled.