Oh a triangulator machine! Very cool! Right, there are four different types of triangle. First, here's an isosceles triangle, it has two equal length sides and two equal angles. Oh! Very clever!

ZACH: Oh yes, it must be an isosceles triangle because it has two equal sides.That other side is also 6 metres then, and we know the perimeter is 14.How do we get that missing side? KAYLA ...