Question

A rectangular board has an area of 648 square centimeters. The triangular part of the board has an area of 162 square centimeters. A dart is randomly thrown at the board.

A triangle is inside of a rectangle. The height of the triangle is the same as the height of the rectangle.

Assuming the dart lands in the rectangle, what is the probability that it lands inside the triangle? Round to the nearest whole percent.

18%
25%
35%
50%

Answer 1

Probability = triangle area / rectangle area = 162 / 648 = 0.25 = 25%.