Hubert Khoo's answer to LockB's Secondary 3 E Maths Singapore question.
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Solution for question 3
1st part is formula, 0.5 * r * theta.
2nd part, the circumference of a circle is 2*pi*r. But a sector chunk has been removed. 2*pi is the total amount of radians in a circle that comprises 360 degrees. Hence the remaining circumference is 2*pi - 1.2 rad. Dont forget to add the 2 radii lines that are now exposed and is considered the perimeter.
I will not solve the other questions, post them separately
1st part is formula, 0.5 * r * theta.
2nd part, the circumference of a circle is 2*pi*r. But a sector chunk has been removed. 2*pi is the total amount of radians in a circle that comprises 360 degrees. Hence the remaining circumference is 2*pi - 1.2 rad. Dont forget to add the 2 radii lines that are now exposed and is considered the perimeter.
I will not solve the other questions, post them separately
Date Posted:
3 years ago
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