Please help?
2 Answers
The area of the triangle is
Explanation:
Calculating the height of the triangle
The area is of a triangle is given by
from the diagram the base is 21ft
from the previous calculation the height is 8ft
The area of the triangle is
If you are confused of why this calculation is true, look at the image below:
Explanation:
We use the Laws of Cosines, which states that:
Therefore,
We now have:
=>
=>
=>
=>
Now, we use the Heron's Formula, which states that:
Therefore,
=>
We plug in the values.