Question

An isosceles triangle has sides of xcm, xcm and 9cm, its perimeter is less than 19 and x is a whole number. find the lowest value of x

Answer 1

• 1 cm

Explanation:

Given triangle with:

• Sides = x cm, x cm and 9 cm
• P < 19 cm

Set an inequality:

• x + x + 9 < 19
• 2x < 10
• x < 5

As the side can't be negative, the lowest value of x is 1 cm