option c is correct.
step-by-step explanation:
the rule regarding the sides of triangle is:
(length of longest side)^2 = square of sum of other two sides.
the sides given are:
6, 10 and 8.
applying the rule we will get:
(10)^2 = (6)^2 + (8)^2
100 = 36+64
100 = 100
so, her answer is incorrect.
no, she should have added 6^2 and 8^2 and compared that to 10^2.
so, option c is correct.