John is moving up to the attic and wants to paint on wall blue. The wall is a triangle with a base of 21 feet and a height of 8 feet. What is the area of the wall to be painted?
1. 42 ft
2. 62 ft
3. 29 ft
4. 84 ft
4. 84 ft
To find the area of the wall to be painted, we can use the formula for the area of a triangle: A = (1/2) * base * height.
1. Substitute the given values:
A = (1/2) * 21 ft * 8 ft
2. Multiply:
A = 10.5 ft * 8 ft
3. Calculate:
A = 84 ft²
Therefore, the area of the wall to be painted is 84 ft².
To find the area of the wall to be painted, we can use the formula for the area of a triangle:
Area = (base * height) / 2
Given that the base is 21 feet and the height is 8 feet, we can substitute these values into the formula:
Area = (21 * 8) / 2
= 168 / 2
= 84 ft
Therefore, the correct answer is option 4. The area of the wall to be painted is 84 square feet.