The magnitude of vector (-7,-5) =
=
<span>vector as the sum of unit vectors = -7 i - 5 j</span>
=
<span>vector as the sum of unit vectors = -7 i - 5 j</span>
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Answer:
Area of triangle = 15 square units
Step-by-step explanation:
We need to find area of the triangle, given the vertices:
A=(4,0)
B=(1,5)
C=(7,5)
The formula used is:
We have:
Putting values and finding area
We will be ignoring negative sign, because area of triangle is positive.
So, Area of triangle = 15
If this is an equilateral triangle, we need half of it to find the height which is a leg of a right triangle with a hypotenuse of 15. That means that the base of this half triangle is 7.5. Use Pythagorean's Theorem to fine the height. 
. x = 12.99 or 13