i need help with geometery angles in parallel lines

The line L passes through the points P ( -1,2) and Q (11,8). A) Find an equation for L in the form y= mx+c, where m and c are constants. ( I'm fine with this part of the question) B) The line Z passes through the point R (10,0) and is perpendicular to L. The lines L and Z intersect at the point S. Calculate the coordinates of S ( to find the coordinates of S you equate the first equation L to the equation of the second line Z and then find the values of x and y I think? Please correct me if I'm wrong) C) Show that the length of RS is 3 square root 5 (Use formula of finding the length of a straight line)

D) Hence, or otherwise, find the exact area of triangle PQR This is the part I'm struggling with, please answer if you can Thanks

The measure of an angle is 20° less than the measure of its supplement. Find the measure of the angle and the measure of its supplement.

Roland drove 8 miles east and 5 miles north, how far is he from the starting point? Round to the nearest tenth.

OK there is a diagram a rectangle with a triangle on top. The triangles base is 6 while the height is 4. Thevrectangles base is 36 and it's height is 20. Here is the question: The diagram gives the dimensions of a swimming pool.If a cover is needed for the pool,what will be the approximate area of the cover?

It's about quadrilaterals inscribed in circles.

a triangle with one obtuse angle