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#### Resources tagged with Cosine rule similar to Semi-detached:

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##### Other tags that relate to Semi-detached
Squares. Scale factors. Cosine rule. Inscribed polygons. Perimeters. Inscribed circle. Area. Pythagoras' theorem. Circles. smartphone.

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Broad Topics > Trigonometry > Cosine rule

##### Stage: 4 Challenge Level:

Given a square ABCD of sides 10 cm, and using the corners as centres, construct four quadrants with radius 10 cm each inside the square. The four arcs intersect at P, Q, R and S. Find the. . . .

### Xtra

##### Stage: 4 and 5 Challenge Level:

Find the sides of an equilateral triangle ABC where a trapezium BCPQ is drawn with BP=CQ=2 , PQ=1 and AP+AQ=sqrt7 . Note: there are 2 possible interpretations.

### Hexy-metry

##### Stage: 4 Challenge Level:

A hexagon, with sides alternately a and b units in length, is inscribed in a circle. How big is the radius of the circle?

### Calculating with Cosines

##### Stage: 4 and 5 Challenge Level:

If I tell you two sides of a right-angled triangle, you can easily work out the third. But what if the angle between the two sides is not a right angle?

### Darts and Kites

##### Stage: 4 Challenge Level:

Explore the geometry of these dart and kite shapes!