If the exterior sides of two adjacent angles are perpendicular, then the angles are angles. complementary right vertical supplementary

Step-by-step explanation:

The statement is defining two adjacent triangles that are on a right angles, that is, a angle equal to 90°. We can deduct this because they problem states that their exterior sides are perpendicular, these sides are forming a right angle, because that's what perpendicularity means.

Therefore, the right term that completes the statement is "complementary", because complementary angles are define as adjacent angles which sum is 90°.

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