Triangle jkl has vertices at the following coordinates: j(2, 2), k(-1, 3), and l(-2, -1). determine whether or not triangle jkl is a right triangle. show all calculations for full credit.

J(2,2)
K(-1,3)
L(-2,-1)

In order to determine whether JKL is a right angle triangle, the gradient of JK and KL must follow this rule:

       <--- this rule is used to determine right angles

Use this formula to find the gradient:

m = 

Gradient of JK = 
                        = 

Gradient of KL = 
                        = 4

Now, multiply the two gradients,

x 4 = 

As we can see, this answer does not satisfy the rule where the multiple of the two gradients equal one.

Since there is no right angle, triangle JKL is NOT a right angle triangle.

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