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In a right angled triangle, the two non-right angles are complementary, because in a triangle the three angles add to 180°, and 90° has already been taken by the right angle. When two angles add to 90°, we say they "Complement" each other.

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Chea phanakphu

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3y ago

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Supplementary: two or more angles equal 180 degrees.

Complementary: two or more angles equal 90 degrees.

All three angles of a triangle will always add up to 180 degrees, therefore it is supplementary.

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Wiki User

12y ago
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Give me answer

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Daksh Thakor

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4y ago
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Q: Is a triangle supplementary or complementary?
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