Triangles
What is the name of a triangle with 3 equal sides and 3 equal angles?
Equilateral
Complementary angles add up to what?
90 degrees
What 4 quadrilaterals have 2 pairs of parallel sides?
Parallelogram, square, rectangle, rhombus
Two lines that run next to each other like train tracks. They will never touch.
Parallel lines
How many degrees are there inside a triangle?
180 degrees
Supplementary angles add up to what?
180 degrees
What are the 3 features of a square? (HINT: sides, angles, & parallel pairs)
All 4 sides equal length, 4x 90 degree angles, 2x parallel pairs
What are the 3 features of a rhombus? (HINT: sides, angles, & parallel pairs)
4 equal sides, diagonally opposite angles are equal, 2x parallel pairs
The name of a triangle with one 90 degree angle
Right triangle or right-angled triangle
What is the rule for corresponding angles (HINT: you will need the shape and the relationship)
F-rule, a=b
What are the 3 features of a rectangle? (HINT: sides, angles, & parallel pairs)
opposite sides of equal length, 4x 90 degree angles, 2x parallel pairs
What is the rule for vertically opposite angles (HINT: you will need the shape and the relationship)
X-rule, a=a
A triangle with 2 sides and 2 angles that are the same
Isosceles triangle
What type of angle does the Z-rule involve & what is the relationship?
Alternate angles, a=b
What are the 3 features of a parallelogram? (HINT: sides, angles, & parallel pairs)
Opposite sides of equal length, diagonally opposite angles are equal, 2x parallel pairs
What are the 3 features of a trapezium? (HINT: sides, angles, & parallel pairs)
1x opposite sides are equal length, 2x pairs of equal angles, 1x parallel pair
A triangle with all different sides and angles
Scalene triangle
What is the rule for co-interior angles (HINT: you will need the shape and the relationship)
C-rule, a+b=180
What are the 3 features of a kite? (HINT: sides, angles, & parallel pairs)
How can we prove there are 180 degrees in a triangle (HINT: remember the cut & paste activity with the triangle corners)
If you cut all the corners off a triangle and put them together, you get a straight line. We know that there are 180 degrees in a straight line, so there must also be 180 degrees in a triangle.