The horizontal and vertical distances between adjacent points equal 1 unit. Find the area of triangle .

Source: Julia Robinson Mathematics Festival

**SOLUTION**

**
**area of triangle = area of triangle + area of triangle + area of trapezoid

= area of triangle +

Multiply both sides by 2

area of triangle

= area of triangle

Simplify

area of triangle

area of triangle

area of triangle

area of triangle

**Answer**: square unit.

Advertisements