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Complete the following theorem statement: The line drawn from the centre of a circle to the midpoint of a chord is … The diagram below shows a circle with centre O - NSC Technical Mathematics - Question 7 - 2022 - Paper 2

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Complete the following theorem statement: The line drawn from the centre of a circle to the midpoint of a chord is … The diagram below shows a circle with centre O... show full transcript

Worked Solution & Example Answer:Complete the following theorem statement: The line drawn from the centre of a circle to the midpoint of a chord is … The diagram below shows a circle with centre O - NSC Technical Mathematics - Question 7 - 2022 - Paper 2

Step 1

Determine the length of OM.

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Answer

To find the length of OM, we first recognize that the diameter of the circle can be calculated as the sum of lengths AP and PB:

OM=AP+PB=16extm+4extm=20extmOM = AP + PB = 16 ext{ m} + 4 ext{ m} = 20 ext{ m}

Since OM is the radius, we can divide the diameter by 2:

OM=202=10extmOM = \frac{20}{2} = 10 ext{ m}

Step 2

Determine, stating reasons, the length of MP.

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Answer

We apply the theorem that states the line drawn from the centre of a circle to the midpoint of a chord is perpendicular to the chord. Therefore, we can use the Pythagorean theorem to solve for MP:

  • We know OP is perpendicular to MN, which implies (OP = 90^{\circ}).

Using the Pythagorean theorem:

OM2=OP2+MP2OM^2 = OP^2 + MP^2

Substituting the known values:

102=62+MP210^2 = 6^2 + MP^2

Calculating:

100=36+MP2100 = 36 + MP^2

Subtracting 36 from both sides yields:

MP2=64MP^2 = 64

Taking the square root gives:

MP=8extmMP = 8 ext{ m}

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