How could we understand that the right triangles of trigonometry with a hypotenuse of measure 1 represent all possible right

Ultimately, the similarity of triangles is the basis of proportions between sides of two triangles, and these proportions allow for the calculations of which we are speaking here

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5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116