Triangles KS2

What do we call a triangle with one right angle?

• Obtuse triangle
• Acute triangle
• Right-angled triangle
• Scalene triangle

How many lines of symmetry does an isosceles triangle have?

• 1
• 2
• 3
• 4

What is the sum of the angles in any triangle?

• 180 degrees
• 90 degrees
• 360 degrees
• 270 degrees

Which triangle has two sides of equal length?

• Scalene triangle
• Equilateral triangle
• Isosceles triangle
• Right-angled triangle

What type of triangle has all three sides of different lengths?

• Isosceles triangle
• Equilateral triangle
• Scalene triangle
• Right-angled triangle

How many lines of symmetry does an equilateral triangle have?

• 1
• 2
• 3
• 4

If a triangle has angles of 50 degrees and 60 degrees, what is the third angle?

• 100 degrees
• 90 degrees
• 80 degrees
• 70 degrees

What is the name of a triangle that has all sides of equal length?

• Scalene triangle
• Isosceles triangle
• Equilateral triangle
• Right-angled triangle

If a triangle has angles of 45 degrees and 45 degrees, what is the type of this triangle?

• Scalene triangle

• Isosceles triangle

• Equilateral triangle

• rhombus

What is the perimeter of an equilateral triangle with each side measuring 5 cm?

• 10 cm

• 15 cm

• 20 cm

• 25 cm