Did I get this right?

Question

anonymous · Answer

Quadrilateral OPQR is inscribed inside a circle as shown below. What equation would be needed to solve for angle R? What is the measure of angle R? You must show all work and calculations to receive credit.

y+(3y+8)=180
y+3y+8=180
4y+8=180
   (-8)
4y=172
/4  /4
y=43

angle r=3
angle r=3y+8
angle r=137

anonymous · Answer

attachment

dan815 · Answer

What makes you say the opposite angles in the quad add upto 180

anonymous · Answer

http://www.geom.uiuc.edu/~dwiggins/conj47.html

dan815 · Answer

pretty cool :) such a simple proof

anonymous · Answer

so it's correct? or do i need to revise? :)

dan815 · Answer

its probably right, you can check if its right yourself, sub the r back into the equation and both angles will add upto 180

anonymous · Answer

k, thank you.

dan815 · Answer

y+(3y+8)=180
43+(3(43)+8)=4*43+8=160+12+8=180