Question

find the area of each triangle.

Explanation:

Step1: Recall triangle - area formula

The formula for the area of a triangle is $A=\frac{1}{2}bh$, where $b$ is the base and $h$ is the height.

Step2: Count base and height from the grid

For the first triangle (a), assume the base $b = 6$ units and height $h = 6$ units. Then $A=\frac{1}{2}\times6\times6= 18$ square - units.
For the second triangle (b), assume the base $b = 6$ units and height $h = 4$ units. Then $A=\frac{1}{2}\times6\times4 = 12$ square - units.

Answer:

a. 18 sq. units
b. 12 sq. units