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den301095 [7]
3 years ago
8

8. Peter and his partner are conducting a physics experiment on pendulum motion. Their 30-cm

Mathematics
1 answer:
katrin2010 [14]3 years ago
8 0

Answer: 90/pi degrees

Step-by-step explanation:

It forms a 15cm arc from a circle of radius 30 cm.

The diameter is 30*2*pi = 60pi cm. So the arc is 15/60pi = 1/4pi of the way around a 360 degree circle. This is 1/4pi * 360 = 90/pi degrees.

Hope that helped,

-sirswagger21

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11. m ∠ BCE = 25 °

m ∠BAD = 39°

12. n = 11. 5°

13. The quadrilaterals are rectangle and parallelogram. Option A and C

14. HK = 8cm

<h3>How to determine the angles</h3>

11. From the figure shown, we have that;

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Note that m ∠ ADE is alternate and equal to m∠ DEC = 52 and is also on a straight line with ∠BEC

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∠BEC = 180 - 52° = 128°

Remember that  ∠BEC,  ∠ BCE  and ∠ EBC are angles in a triangle which sum up to 180°

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∠ BCE = 25 °

To determine m ∠BAD

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12. Value of n is gotten by equating the two lengths

( 10n + 19) = (12n - 4)

collect like terms

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13. The only quadrilaterals with congruent diagonals are;

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