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boxycox
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#1
A parallelogram PQRS has area 50cm²
Given:
- PQ has length 14cm
- QR has length 7cm
- angle SPQ is obtuse
find:
a) the size of angle SPQ, in degrees, to 2 decimal places
b) the length of the diagonal SQ, in cm, to one decimal place
Given:
- PQ has length 14cm
- QR has length 7cm
- angle SPQ is obtuse
find:
a) the size of angle SPQ, in degrees, to 2 decimal places
b) the length of the diagonal SQ, in cm, to one decimal place
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Pangol
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#2
(Original post by boxycox)
A parallelogram PQRS has area 50cm²
Given:
- PQ has length 14cm
- QR has length 7cm
- angle SPQ is obtuse
find:
a) the size of angle SPQ, in degrees, to 2 decimal places
b) the length of the diagonal SQ, in cm, to one decimal place
A parallelogram PQRS has area 50cm²
Given:
- PQ has length 14cm
- QR has length 7cm
- angle SPQ is obtuse
find:
a) the size of angle SPQ, in degrees, to 2 decimal places
b) the length of the diagonal SQ, in cm, to one decimal place
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boxycox
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#3
(Original post by Pangol)
I'd start by drawing a sketch, and then add a line joining Q and S. Then think about triangle PQS only. You can easily see what the area of this triangle is, and there is only one simple formula you know for the area of a triangle - that should do the first part for you. The second part is then easy.
I'd start by drawing a sketch, and then add a line joining Q and S. Then think about triangle PQS only. You can easily see what the area of this triangle is, and there is only one simple formula you know for the area of a triangle - that should do the first part for you. The second part is then easy.
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Pangol
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#4
(Original post by boxycox)
Yeah, I found that angle to be 30.6 degrees. It was the obtuse part that I don't understand.
Yeah, I found that angle to be 30.6 degrees. It was the obtuse part that I don't understand.
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SvhwiaishebSee
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allan.turing15
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#6
You minus the 30.68 from 180 to give the obtuse angle which so the answer for (a) is 149.32
For B you make a line from the diagram and then you use the cosine rule the angle would be 30.7 and the 2 lengths of the triangle will be 14 and 7.
For B you make a line from the diagram and then you use the cosine rule the angle would be 30.7 and the 2 lengths of the triangle will be 14 and 7.
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lydia5
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#7
where did you get the paper from ??
please ASAP
please ASAP
Last edited by lydia5; 5 months ago
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Nayel
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dogbo
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#9
would the answer to B be 20.3cm or 8.7cm? as you said use 30.68 as angle but wouldn’t the obtuse calculated be used instead?
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