Toraayyyy's blogg.

In this blog, I will go over section 9-2, which involves the area of right and non-right triangles.1/2 bh - only right triangles1/2 ab sin(angle between) - only for non-right trianglesEx. This is just a regular triangle. The left side is 7 and the right side is 4. The angle between them is 73 degrees. This is a non-right triangle.A=1/2 ab sin(theta)A=1/2(7)(4) sin73A=14sin73A=13.388 cm squaredEx. 2 The area of triangle PQR is 15. p=5 and q=10. Find all possible measures of angle R.Draw a regular triangle. (An arbitrary one as B-Rob says.)Bottom left point=P; Top point=Q; Bottom right point=R15=1/2(5)(10) sin (theta)15=25 sin (theta)sin(theta)=15/25(theta)=sin^-1(15/25)(theta)=36.870 degrees36.870 is in the first quadrant. Sin is positive in Q I and II.-36.870+180=143.130 degrees.So theta=36.870 degrees and 143.130 degrees.