Question 10
Example 9. The figure shows a triangle, $PQR$.
a) Find the total area of the shaded parts in terms of $x$.
b) If $x=7$, find the total area of the shaded parts.
**Editorial input convention:** Enter the expression in x for a and the numerical area for b, separated by a comma; omit units. Example format only: 5x, 35.
**Editorial input note:** Use no spaces anywhere in your entry, including within the expression. Apply this rule to the format example above.
a) Find the total area of the shaded parts in terms of $x$.
b) If $x=7$, find the total area of the shaded parts.
**Editorial input convention:** Enter the expression in x for a and the numerical area for b, separated by a comma; omit units. Example format only: 5x, 35.
**Editorial input note:** Use no spaces anywhere in your entry, including within the expression. Apply this rule to the format example above.