Eric Nicholas K's answer to holowinwin's Secondary 3 E Maths Singapore question.
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(a) requires you to understand the radian form of angles rather than the degree form of angles.
(b) and (c) require you to recall the formulae for the length of an arc given the radii and the angle in radians, area of a sector given the radii and the angle in radians and the area of a triangle given two sides and an included angle.
The final answer is 138.1915911 cm2, which is approximately 138 cm2.
(b) and (c) require you to recall the formulae for the length of an arc given the radii and the angle in radians, area of a sector given the radii and the angle in radians and the area of a triangle given two sides and an included angle.
The final answer is 138.1915911 cm2, which is approximately 138 cm2.
Date Posted:
5 years ago
The last few lines containing square root of 3 is not required; we can straight away plug in sin (2 pi/3) into the calculator.
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