Question

1. which formula is used to find the area of a triangle?

a. ( a = l cdot w )

b. ( a = \frac{1}{2}b cdot h )

c. ( a = pi r^2 )

d. ( a = s^2 )

Explanation:

• Option A: \( A = l \cdot w \) is the formula for the area of a rectangle (length times width), not a triangle.
• Option B: \( A=\frac{1}{2}b \cdot h \) is the formula for the area of a triangle, where \( b \) is the base and \( h \) is the height.
• Option C: \( A=\pi r^{2} \) is the formula for the area of a circle, where \( r \) is the radius.
• Option D: \( A = s^{2} \) is the formula for the area of a square, where \( s \) is the side length.

Answer:

B. \( A=\frac{1}{2}b \cdot h \)