Solution: According to the question, the coordinates of 4 points form a quadrilateral. This quadrilateral is shown in the below figure Now by making use of the distance formula, we have: This is...

Solution: $ 24.5\text{ }=\text{ }28x-14 $ $ 28x\text{ }=\text{ }38.5 $ $ x\text{ }=\text{ }38.5/28 $ $ =\text{ }1.375 $

Solution: Given: The coordinates of triangle. From the figure, By using cosine formula, In ΔABC, we have:

Solution: According to the question, two points P and Q make an angle α at the origin. This is shown in the figure: It can be observed from the figure that points P, O and Q form a triangle. So, in...