Tangents to circles

Geometry Level 3

The common tangents to the circles x2+y2+2x=0x^{2}+y^{2}+2x=0 and x2+y26x=0x^{2}+y^{2}-6x=0 form a triangle which is __________.\text{\_\_\_\_\_\_\_\_\_\_}.


Note: Pick the best option.

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