1) An acute angle is... a) an angle more than 90º but less than 180º b) an angle less than 90º 2) An obtuse angle is... a) an angle more than 90º but less than 180º b) an angle less than 90º 3) Acute triangles have ... a) 3 acute angles b) 3 obtuse angles c) 1 acute angle d) 1 obtuse angle 4) Obtuse triangles have ... a) 3 acute angles b) 1 acute angle c) 3 obtuse angles d) 1 obtuse angle 5) Choose the obtuse triangle. a) b) c) 6) Which is the equilateral triangle? a) b) c) d) 7) Which triangle is isosceles? a) b) c) d) 8) Choose the scalene triangle a) b) c) d) 9) An equilateral triangle... a) has 3 different lengths and 3 different angles. b) has 3 sides of equal length only. c) has 3 sides of equal length, and each inside angle is the same size. 10) A right-angled triangle... a) has one angle 90º. b) has 3 sides all different lengths. c) has an angle less than 90º. 11) An isosceles triangle... a) has all 3 sides different lengths. b) has 2 sides that are equal length. c) has all 3 sides equal length. 12) A scalene triangle... a) has all 3 sides different lengths and all 3 angles different sizes. b) has all 3 equal sides the same length. c) has one 90º angle. 13) What type of triangle is this? a) Acute b) Right-angled c) Equilateral d) Isosceles e) Scalene 14) What type of triangle is this? a) Isosceles b) Right-angled c) Equilateral d) Obtuse e) Scalene 15) What type of triangle is this? a) Scalene b) Isosceles c) Obtuse d) Right-angled e) Acute 16) What type of triangle is this? a) Right-angled b) Scalene c) Acute d) Isosceles e) Obtuse

Types of Triangles

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