# Trapezoidal rule More Options: Make a Folding Card

measurement

#### Storyboard Text

• Hey I heard you were having trouble working out what the trapezoidal means
• Yes, and i need to know what it means for my maths test today.can you help me
•  This is the formula you must remember
• Formula:A= h\2 (a+b)
• If theres a question on the test that asks you to use 'one application' heres what you do
• Theres is actually two ways of using this formula, however one is much more accurate tham the other
• Imagine that this is a pond and you need to work out the the area using 1 application of the trapezoidal rule.
• Heres what you do!
• A=h/2 (a+b)A= 20/2 X (4+8)A= 120cm
• 4cm
• 10cm     10cm
• oh, that makes sense!!!
• 12cm
• 8cm
• A=h/2 (a+b)
• However if it asked you to answer the question by using 2 applications here is what you will do.JUST REMEMBER THAT THIS METHOD IS A LOT MORE ACCURATE
• Total Area= 80cm+100cm
• = 180cm squared
• A1= 10/2 x (4+12)A1= 80cm squaredA2= 10/2 x (12+8)A2=100cm squared
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