revision of triangle geometry

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Last updated 2:06 PM on 5/3/26
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7 Terms

1
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Can all interior angles of an acute angled triangle be any value.

No they must be acute(<90°)

2
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Property of obtuse angled triangles

The largest interior angle >90°. Other two are acute(<90°)

3
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Property of Right angled Triangles

Largest interior angle is 90°. Other two are acute(<90°)

4
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Property of Scalene Triangles

Neither sides nor angles are equal; all are different values

5
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Property of Isosceles Triangle

Two adjacent sides and opp angles are =

Eg. AB=CD if Â=Č (sides opp = angl’s)

Â=Č if AB=CD (angl’s opp = sides)

6
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Property of sum of interior angles of  triangle

Sum of interior angles of a triangle are supplementary(180°)

7
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Property of exterior angle of triangle

Exterior angle of triangle is equal to sum of other interior angles