Angles of Triangles and Polygons

Angles in Polygons

LO: To know the angles in a triangle, straight line and regular polygon

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Angles on a straight line add up to ...... degrees

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Angles on a point add up to ...... degrees

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A right angle is ...... degrees

Multiple Choice

Angles in Parallel Lines.

Angles in a F shape are called....

• Alternate

• Corresponding

• Co-interior

Open Ended

Write a definition of a regular polygon

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Tell me the name of an 8 sided polygon

Multiple Choice

What do the angles in a Pentagon add up to?

• 3x180 = 540

• 2x180 = 360

• 4x180 = 720

• 5x180 = 900

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How many triangles can I split a hexagon (6 sided shape) into?

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How many triangles can I split an octagon (8 sided shape) into?

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What do the interior angles in an octagon add up to?

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Use your calculator to work out the total of all interior angles in a 15 sided polygon

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Use your calculator to work out the total of all interior angles in a 21 sided polygon

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Use your calculator to work out the total of all interior angles in a 100 sided polygon

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Use your calculator to work out the total of all interior angles in a 182 sided polygon

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Use your calculator to work out the total of all interior angles in a 102 sided polygon

Multiple Choice

How many degrees in ONE interior angle of a regular hexagon?

• 60

• 120

• 180

• 720

Multiple Choice

How many degrees in ONE exterior angle of a regular hexagon?

• 60

• 120

• 180

• 720

Multiple Choice

Is this shape regular?

• Yes

• No

Multiple Choice

What is the missing angle?

• 540 - (127+84+114+97) = 118

• 720 - (127+84+114+97) = 298

• 900 - (127+84+114+97) = 478

Multiple Choice

What is the SUM of the exterior angles of a 20-gon?

• 180

• 360

• 3240

• 162

Multiple Choice

What is the measure of ONE interior angle in a regular pentagon (5-sides)?

• 90°
• 108°
• 120°
• 180°

Multiple Choice

Find the value of y.

• 125
• 135
• 140
• 110

Multiple Choice

Find the value of X

• 94
• 25
• 36
• 180

Multiple Choice

The measures of one interior angle of a regular polygon is 140^o. What is the name of the polygon?

• Decagon

• Nonagon

• Heptagon

• Hexagon

Multiple Choice

Find the measure of angle K.

• 9
• 97°
• 48°
• 79°

Poll

How confident do you feel to find interior and exterior angles?

• I feel confident finding Exterior, need to practice Interior

• I feel confident finding Interior, need to practice Exterior

• VERY confident! These exam questions seem easy (ish)

• Can we spend another lesson on these?