



 
Hi Evelyn, Suppose the triangle is ABC and AB = BC. Draw a line from D, the midpoint of CA to B. Since triangles BCD and ABD are congruent, angle BDA is a right angle and BD is the height of the triangle. You know AB and DA = 1/2 CA and triangle BDA is a right triangle so you can use Pythagoras theorem to find BD. Penny  


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