The third side of the triangle is greater than the difference of the lengths of the other two sides (h > 7x cm - 3x cm) and it is less than the sum of the lengths of the other two sides (h < 7x cm + 3x cm). Therefore: h > 7x - 3x h < 7x + 3x
This can be expressed as: 7x cm - 3x cm < h < 7x cm + 3x cm ⇒ 4x cm < h < 10x cm
