Triangles

The sum of the angles in a triangle is

• 180 degrees

• 200 degrees

• 170 degrees

• 360 degrees

Tags

CCSS.8.G.A.5

The formula to find the area of a triangle is

• base multiplied by height
  

•  $0.5\times b\times h$  

• base multiplied by height then divide by three
  

•  $0.25\times b\times h$  

Pythagoras theorem can be expressed as

• $a^2+b^2$

• $0.5\times a^2\times b^2$

• $a^2=b^2+c^2$

• $a^2+b^2+c^2=d^2$

• left-angled triangle

• isosceles triangle

• equilateral triangle

• right-angled triangle

Similar triangles

• are always the same shape

• are the same size and shape

• each have 3 sides

• have corresponding angles that are equal

• equilateral triangle

• isosceles triangle

• scalene triangle

• right-angled triangle

• y = z + x

• z = x + y

• y + z - x = 0

• 180 = x + y + z

An isosceles triangle ...

• has 3 equal sides

• has at least 2 equal angles

• can be a right-angled triangle

• has angles that sum to 190 degrees

An equilateral triangle

• has 3 equal angles

• has 3 lines of symmetry

• has 4 angles

• has three equal sides

Congruent triangles

• always have 2 lines of symmetry

• have no lines of symmetry

• have corresponding angles that are unequal

• are the same size and shape