The triangle-shaped entrance to the cavern is 2 1/2 feet tall and 4 feet wide. What is the area of the entrance?

5 feet²

Step-by-step explanation:

The area of entrance = area of triangle

Height, h = 2 1/2 feets

Width, w = 4 feets

The Area of a triangle is given as :

1/2 * base * height

Base = width = 4 feets

Area of entrance = 0.5 * 4 * 2.5

Area of entrance = 5 feet²

Hence, the area of the entrance is 5 feet square.

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