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November 01, 2025, 10:46:29 am
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Author Topic: Geometry Questions 2009 VCAA exam 2  (Read 623 times)  Share 

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iwannagetA

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Geometry Questions 2009 VCAA exam 2
« on: November 02, 2010, 01:15:01 pm »
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Question 3

a) 360/5 = 75*

b) show that, correct to two decimal places the length OP is 25.52cm.

we are only give length of PQ = 30 cm and the angle in a) 75*

how to do this question???
they used the sine rule 30/sin75* = x/sin54*


how did they get 54*???
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jasoN-

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Re: Geometry Questions 2009 VCAA exam 2
« Reply #1 on: November 02, 2010, 01:17:22 pm »
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(180 - 72)/2 = 54, you can assume the triangle is isosceles with angles OPQ and OQP equalling each other
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iwannagetA

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Re: Geometry Questions 2009 VCAA exam 2
« Reply #2 on: November 02, 2010, 01:29:00 pm »
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the area of pentagon

1/2 x 30x25.25 >> incorrect?
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