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**ria3** A scalaene triangle has 3 sides: RS = 12.1, ST = 19.8, RT = 17.4. NOw i have to find the area of the triangle.

It didn't say which side was the base, so I made side ST the base. Then, I made a dotted line for the height, H. So now there's 2 triangles: RSY, and RYT. Triangle RSY has RS which is 12.1, and angle Y, which is 90 degrees. How can I figure out other information for triangle RSY with only that info? I thought i'd use trigonometric ratios. So, the sin of Y = o/h = i'm not sure. the hypotenous is 12.1, but what is the opposite side for angle Y, which is a right angle?

Sorry, I know this post must seem rambling.... but thats what progress I've made on the qu., lol. I would appreciate any help you may have. I know, I'm not asking for the answer. I just need some step-by-step instructions to guide me though. thank you.