Triangle abc is an isosceles triangle in which ab = ac. what is the perimeter of △abc?

5 + startroot 10 endroot units

startroot 10 endroot units

10 + startroot 10 endroot units

15 units

Option C.

Step-by-step explanation:

Assume that the below figure attached with this question.

Distance formula:

From the below figure it is clear that the vertices of triangle are A(-1,6), B(-1,1) and C(2,2).

Using distance formula we get

Similarly,

The perimeter of △ABC is

The perimeter of △ABC is .

Therefore, the correct option is C.

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