Barbara H. answered 02/12/15
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Enthusiastic mathematics teacher and World Record Swim Coach
Their angles are equal. Their sides are proportional. For example, if a smaller triangle has angles 30, 60 and
90 degrees, then the larger similar triangle has the same degrees. If a smaller triangle has sides 3, 4 and 5,
the larger similar triangle could have sides 6, 8 and 10 or 9, 12 and 15 etc....