1) All three sides are equal in length; all three angles are equal (each 60°). a) scalene b) isosceles c) equilateral d) right 2) Two sides are equal in length; two angles are equal. a) scalene b) right c) acute d) isosceles 3) All three sides are of different lengths; all three angles are different. a) right b) scalene c) isosceles d) equilateral 4) One angle is 90°; the other two angles are acute. a) isosceles b) scalene c) equilateral d) right 5) One angle is greater than 90°; the other two angles are acute. a) obtuse b) right c) isosceles d) equilateral 6) All three angles are less than 90°. a) scalene b) isosceles c) obtuse d) acute 7) What is the sum of angles in a triangle? a) 180 degrees b) 90 degrees c) 360 degrees d) 270 degrees 8) What type of triangle has all equal sides? a) Scalene b) Isosceles c) Equilateral d) Right 9) Which triangle has one angle greater than 90 degrees? a) Acute b) Right c) Obtuse d) Equilateral 10) What is a triangle with two equal sides called? a) Scalene b) Isosceles c) Equilateral d) Right 11) Which triangle has all angles less than 90 degrees? a) Acute b) Right c) Obtuse d) Scalene 12) Which property is true for all triangles? a) Sum of angles is 180 b) All sides equal c) One angle 90 d) Two sides equal 13) What is the area formula for a triangle? a) Base x Height / 2 b) Length x Width c) Side x Side d) Radius x Radius 14) What is a triangle with no equal sides called? a) Scalene b) Isosceles c) Equilateral d) Right 15) Which triangle has a 90-degree angle? a) Right b) Acute c) Obtuse d) Equilateral

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