The answer is 2:1 because at first your ratio would be 18:9 but if you divide that by 9 (for simplifying purposes) than its 2:1
No an equilateral triangle has three 60° angles it has no right (90°) angle. A right angled triangle can be an isosceles triangle but not an equilateral one.
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Answer:
IQR = 63-54 = 9
Hope that answers your question
Step-by-step explanation: