Problems from Perimeter and area of a triangle

Development:

1. $A={\displaystyle \frac{b\cdot h}{2}}$, where $b$ is the basis and $h$ the height. Applying the formula we get: $$A={\displaystyle \frac{11\cdot 7}{2}}=38,5{\text{cm}}^2$$

2. The perimeter is the sum of all the sides of the triangle.

$P=a+b+c=11+11+7,5=29,5$cm

3. The information of the statement interpreted by our formula is:

$a=11,b=11,c=7,5$

Then we have: $p={\displaystyle \frac{a+b+c}{2}}={\displaystyle \frac{11+11+7,5}{2}}=14,75$

Solution:

1. $38,5{\text{cm}}^2$
2. $29,5$ cm
3. $14,75$ cm

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