What is the area of a triangle with base 10 and height 6?

• A. 60
• B. 30
• C. 15
• D. 45

Answer: (B)

The area of a triangle is half the product of its base and height. Multiply the base 10 by the height 6 to get 60, then take half of that to get 30. So the area is 30 square units. If you forgot the half, you’d get 60; if you halved twice, you’d get 15; 45 would come from using a different height (like 9) instead of 6.