what is the area of triangle qrs?\no 7 square units\no 9 square units\no 10 square units\no 13 square units

Explanation:

Step1: Identify base and height

Let's consider the base along the vertical - like line and height along the horizontal - like line. If we consider the vertical distance between the highest and lowest points of the triangle as the base and the horizontal distance from the out - most left point to the out - most right point related to the triangle as the height. Counting the grid units, assume the base $b$ and height $h$. By counting the grid squares, the base $b = 5$ units and the height $h= 4$ units.

Step2: Apply area formula

The area formula for a triangle is $A=\frac{1}{2}bh$. Substitute $b = 5$ and $h = 4$ into the formula: $A=\frac{1}{2}\times5\times4$.

Step3: Calculate the area

$A=\frac{1}{2}\times20 = 10$ square units.

Answer:

10 square units