Teacher's Notes Topic: Angles, Proof, Algebra

1
Rhombus
Teacher's Notes Topic Angles, Proof, Algebra
L7
Solve the original problem, then ... Change
110 - make it bigger ? - make it smaller
? Relabel the 110 angle as x. What if x 120 ?
x 140 ? Can you work out algebra to link x
and p? What if x is 90 ? What if x is 180 ?
2
Rhombus
The diagram shows a rhombus. The midpoints of
two of its sides are joined with a straight line.
What is the size of angle p ?