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Find the Area triangle (21)(20)

 $\begin{array}{r} b = & 20 \\ h = & 21 \end{array}$

Step 1

The area of a triangle is equal to $\frac{1}{2}$ the base times the height.

$\frac{1}{2} \cdot (b a s e) \cdot (h e i g h t)$

Step 2

Substitute the values of the base $b = 20$ and height $h = 21$ into the formula for the area of a triangle.

$\frac{1}{2} \cdot 20 \cdot 21$

Step 3

Cancel the common factor of $2$ .

Factor $2$ out of $20$ .

$\frac{1}{2} \cdot (2 (10)) \cdot 21$

Cancel the common factor.

$\frac{1}{2} \cdot (2 \cdot 10) \cdot 21$

Rewrite the expression.

$10 \cdot 21$

$10 \cdot 21$

Step 4

Multiply $10$ by $21$ .

$210$

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