А B
1) This shape is a Regular Hexagon. Line
BE is a line of symmetry.
F
с
a) Calculate the size of Angle ABE
b) Work out the size of Angle DCE
c) Calculate the size of Angle BEC
E
D
2) A regular polygon has an exterior angle which is 20°.
a) Calculate the size of its interior angle
b) How many sides must the polygon have? Explain why!

Which best explains why this triangle is or is not a right triangle?

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?