The longest side of an isosceles obtuse triangle measures 20 centimeters. The other two side lengths are congruent but unknown.
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As you've got 15%, the best thing to do is to find 10%, then multiply it by 1.5. Once you've found the tip, you add this onto the cost of the meal.
Therefore, the total cost of $25 meal with a 15% tip is $28.75
Hope this helps :)