1) What is plane figure with 3 sides? a) Triangle b) Quadrilateral c) Circle 2) What is polygon with 3 sides? a) Triangle b) Quadrilateral c) Circle 3) How many degrees of the sum of interior angles in a triangle? a) 180 degrees b) 90 degrees c) 360 degrees 4) How many sides are there in a triangle? a) 2 b) 3 c) 4 d) all are correct 5) How many angles are there in a triangle? a) 2 b) 3 c) 4 d) all are correct 6) What triangle that 3 sides are equal length? a) Equilateral triangle b) Isosceles triangle c) Scalene triangle 7) What triangle that 2 sides are equal length? a) Equilateral triangle b) Isosceles triangle c) Scalene triangle 8) What triangle that 3 sides are different length? a) Equilateral triangle b) Isosceles triangle c) Scalene triangle 9) What triangle that one of the 3 angle is a right angle? a) Right triangle b) Acute triangle c) Obtuse triangle 10) What triangle that each of angles is less than 90 degrees? a) Right triangle b) Acute triangle c) Obtuse triangle 11) What triangle that one of the 3 angles is more than 90 degrees? a) Right triangle b) Acute triangle c) Obtuse triangle

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