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The answer to this is 18cm², how to find the shaded area. I know qn states cross sectional area but when i calculate it it's 100cm², so cannot be.
Date Posted: 6 years ago
Views: 1917
Question wants you to find cross sectional area of the water.
Given that you managed to calculate 100cm³ for the whole cross sectional area, you already know how to find the radius.
So to find the shaded area, find the angle O (angle between the 3 cm dotted line and PO) of the right angled triangle using trigo.
∠ POQ is twice that angle. Then use this to find the area of the sector POQ.
Lastly ,subtract the area of the triangle POQ from it to get the answer.
Given that you managed to calculate 100cm³ for the whole cross sectional area, you already know how to find the radius.
So to find the shaded area, find the angle O (angle between the 3 cm dotted line and PO) of the right angled triangle using trigo.
∠ POQ is twice that angle. Then use this to find the area of the sector POQ.
Lastly ,subtract the area of the triangle POQ from it to get the answer.
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