Question: the perimeter of an equilateral triangle is 60 . if one of the sides of the equilateral triangle is the side of an isosceles triangle of perimeter 45 , then how long is the base of isosceles triangle ?
A) 5 units
B) 10 units
C) 15 units
D) 20 units
E) 25 units
Correct answer: a
Grade: 7 | Topic: Geometry | Difficulty: Hard | Standard: 7.G.A.2