# Shape

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• Created by: lh1002
• Created on: 02-06-16 17:18
How do you find the sum of all interior angles in a polygon?
(n-2) x 180°
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How do you find one interior angle in a regular polygon?
sum of interior angles / number of sides
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How do you find one interior angle in an irregular polygon?
Find the sum of all the interior angles and take away all other given angles in the shape.
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What is the total of all exterior angles in a polygon?
360°
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How do you find one exterior angle in a polygon?
180° - interior angle or 360 / number of sides (FOR REGULAR POLYGONS ONLY)
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How do you find the area of a rectangle?
base x height
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How do you find the area of a parallelogram?
base x height
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How do you find the area of a triangle?
base x height / 2
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How do you find the area of a trapezium?
(a + b) / 2 x height
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How do you find the area of a circle?
'pi'r²
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How do you find the circumference of a circle?
'pi'd or 2'pi'r
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What is a 'Z' angle called and what are the properties of its angles?
Alternate, angles are equal
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What is a 'F' angle called and what are the properties of its angles?
Corresponding, angles are equal
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What is a 'C' angle called and what are the properties of its angles?
Co-interior, angles add up to 180°
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What three things do you have to remember when finding a bearing?
They are always measured from North; they are always measured clockwise; they are always written with 3 figures
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When finding a bearing, where do you draw the North line?
Where the question specifies you are finding the bearing from- the bearing of 'a' FROM 'b'
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## Other cards in this set

### Card 2

#### Front

How do you find one interior angle in a regular polygon?

#### Back

sum of interior angles / number of sides

### Card 3

#### Front

How do you find one interior angle in an irregular polygon?

### Card 4

#### Front

What is the total of all exterior angles in a polygon?

### Card 5

#### Front

How do you find one exterior angle in a polygon?