The cards Question How are trigonometric functions commonly defined? Tap to flip Answer As ratios of two sides of a right-angled triangle for a given angle. Question What is the radius of the unit circle? Tap to flip Answer One. Question Where is the unit circle centred? Tap to flip Answer On the origin. Question On the unit circle, what is the sine of an angle? Tap to flip Answer The y-coordinate of the point reached when the radius is rotated through that angle. Question On the unit circle, what is the cosine of an angle? Tap to flip Answer The x-coordinate of the point reached when the radius is rotated through that angle. Question Using the unit circle, what is the tangent of an angle? Tap to flip Answer The length of the side opposite the angle, along the tangent to the unit circle at x = 1. Question What are the three sides of a right-angled triangle labelled to choose a trigonometric ratio? Tap to flip Answer Opposite, adjacent and hypotenuse. Question Between which values do the y values of the sine and cosine graphs lie? Tap to flip Answer Between −1 and 1. Question What can help you predict what the graphs of the trigonometric functions look like? Tap to flip Answer The unit circle. Question What is the period of a repeating function? Tap to flip Answer The distance of one repetition of the entire function. Question What kind of lines does the tangent graph have? Tap to flip Answer Asymptotes. Question Do the trigonometric functions all have the same period? Tap to flip Answer No, they have different periods. Question Why may a trigonometric equation have more than one solution? Tap to flip Answer Because of the period of the function. Question Can the number of solutions within a given range be predicted? Tap to flip Answer Yes. Question Does a displayed trigonometric graph always show the number of solutions? Tap to flip Answer No; compare the range the graph shows with the range set in the question. Question What does area state? Tap to flip Answer The number of unit squares needed to cover a surface completely. Question What is the formula for the area of a right-angled triangle? Tap to flip Answer 0.5 × base × perpendicular height Question For an equilateral or isosceles triangle, what can be used to find the height? Tap to flip Answer Pythagoras' theorem. Question If you know one of the base angles, which ratio can find a triangle's perpendicular height? Tap to flip Answer The sine ratio. Question What is the formula for the area of any triangle? Tap to flip Answer 0.5ab sin C Question In the area formula 0.5ab sin C, which angle must be used? Tap to flip Answer The angle between the two sides used. Question What must be known to use the area formula for any triangle? Tap to flip Answer The lengths of 2 sides and the size of the angle between them. Question If a triangle's area is known, what can its area formula be used to find? Tap to flip Answer A missing side length or angle. Question What can the sine rule calculate? Tap to flip Answer Either an unknown side length or the size of an unknown angle. Question In a triangle, the sides are proportional to what? Tap to flip Answer The sines of their opposite angles. Question In the sine rule, which side is paired with an angle? Tap to flip Answer The side opposite that angle. Question When is the sine rule useful? Tap to flip Answer When you know an angle and side pair and want to find another pair. Question When is the cosine rule useful? Tap to flip Answer When three sides and an angle are involved. Question Is there only one way to prove the cosine rule? Tap to flip Answer No, there are multiple ways. Question If the sine rule could work, why might you use the cosine rule? Tap to flip Answer The sine rule is not always the most efficient; some problems are much faster with the cosine rule. Question If you are unsure where to start a trigonometry problem, what can you do first? Tap to flip Answer Calculate or deduce what you can. Question When does non right-angled trigonometry have the potential to be applied? Tap to flip Answer Whenever a triangle can be drawn. Question In a trigonometry problem, must you use the sine or cosine rule? Tap to flip Answer No; choose the most appropriate trigonometric knowledge for the problem. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage GCSE (Years 10–11) Course GCSE Maths Unit Non right-angled trigonometry Tiers higher England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-02, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
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A Maths lesson by Oak National Academy licensed under Open Government Licence (OGL)
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