The area of a triangle with base 10 cm and height 3 cm is:

• A. 45 cm^2
• B. 5 cm^2
• C. 30 cm^2
• D. 15 cm^2

Answer: (D)

Area of a triangle is half the product of its base and height. The height is the perpendicular distance from the base to the opposite vertex, so you multiply base by height and then divide by two. Here, base is 10 cm and height is 3 cm, so the area is (10 × 3) / 2 = 30 / 2 = 15 cm². A common mistake is using base × height without halving, which would give 30 cm².