### There are 10 results

Broad Topics >

Pythagoras and Trigonometry > Sine

##### Age 14 to 16 Challenge Level:

An environment that simulates a protractor carrying a right- angled
triangle of unit hypotenuse.

##### Age 14 to 18 Challenge Level:

This problem in geometry has been solved in no less than EIGHT ways
by a pair of students. How would you solve it? How many of their
solutions can you follow? How are they the same or different?. . . .

##### Age 14 to 16 Challenge Level:

How can you represent the curvature of a cylinder on a flat piece of paper?

##### Age 14 to 16 Challenge Level:

On a nine-point pegboard a band is stretched over 4 pegs in a
"figure of 8" arrangement. How many different "figure of 8"
arrangements can be made ?

##### Age 14 to 16 Challenge Level:

The length AM can be calculated using trigonometry in two different
ways. Create this pair of equivalent calculations for different peg
boards, notice a general result, and account for it.

##### Age 14 to 16 Challenge Level:

Can you explain what is happening and account for the values being
displayed?

##### Age 14 to 16 Challenge Level:

A dot starts at the point (1,0) and turns anticlockwise. Can you estimate the height of the dot after it has turned through 45 degrees? Can you calculate its height?

##### Age 14 to 16 Challenge Level:

The sine of an angle is equal to the cosine of its complement. Can
you explain why and does this rule extend beyond angles of 90
degrees?

##### Age 14 to 16 Challenge Level:

The Earth is further from the Sun than Venus, but how much further?
Twice as far? Ten times?

##### Age 14 to 16 Challenge Level:

Three squares are drawn on the sides of a triangle ABC. Their areas
are respectively 18 000, 20 000 and 26 000 square centimetres. If
the outer vertices of the squares are joined, three more. . . .