Question

Out of isosceles triangles with sides of 7 cm and a base with the length expressed by whole number, the triangle with the greatest perimeter was selected. This perimeter is equal to.......

• A. 14 cm
• B. 15 cm
• C. 21 cm
• D. 27 cm

Answer 1

The correct option is D 27 cm

Since sum of the two sides is greater than the third side.

$7+7>x$ [for a triangle]

for max perimeter, $x=13$

$\therefore$ perimeter $=7+7+13=27cm$