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Questions and Answers
Which trigonometric ratio is equal to the cotangent of an angle in a right-angled triangle?
Which trigonometric ratio is equal to the cotangent of an angle in a right-angled triangle?
- Tangent
- Sine
- Cosine (correct)
- Secant
What is the sum of the interior angles of a 12-sided polygon?
What is the sum of the interior angles of a 12-sided polygon?
- 2000 degrees
- 1800 degrees
- 1500 degrees
- 1920 degrees (correct)
If a circle has a radius of 10 cm, what is its circumference?
If a circle has a radius of 10 cm, what is its circumference?
- $20\pi$ cm
- $30\pi$ cm
- $40\pi$ cm (correct)
- $50\pi$ cm
Which transformation does not change the size or shape of a figure?
Which transformation does not change the size or shape of a figure?
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Study Notes
Trigonometry
- The trigonometric ratio that is equal to the cotangent of an angle in a right-angled triangle is the tangent.
Polygon Angles
- The sum of the interior angles of a 12-sided polygon is 180(n-2) degrees, where n is the number of sides, so it is 180(12-2) = 1800 degrees.
Circumference of a Circle
- If a circle has a radius of 10 cm, its circumference is 2πr, so it is 2π(10) = 20π cm.
Transformations
- The transformation that does not change the size or shape of a figure is a rotation.
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